Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Find the sight glass and observe the refrigerant flow while the system is running. Identify the refrigerant before hooking up to a recovery machine. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. - corrosion Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. suction pressure drops to zero while head pressure stays at 300. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Similarly, the fan also has to spin when you turn the system on. When a car pump is broken or damaged, the oil pressure drops. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Low side pressure was between 80-90 at idle. Check for debris on the orifice tube screen. Start the engine and turn on the air conditioner. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. This likely means you're low on refrigerant. Take a look at the temperature/pressure chart for your HVACR system for the specific refrigerant that you are using; you'll need to know the ambient temperature as well. 1. driveaccord.net is not in any way affiliated with Honda Motor Company. As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself. There is no frost on either of the lines. Getting no guage pressure on York heat pump in cooling mode but compressor is running. The Reasons for AC Low Side High, High Side Low Pressure, A Safe and Secure Way to Flush AC System After Compressor Failure. Sounds like a blockage in the high side line to compressor discharge oort. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. Replace clogged orifice tube and flush hoses. There are tools that will replace the valve cores with no r134a refrigerant loss. Thanks. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. The switch is functioning correctly. 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. Question: 2020 mustang air works when it wants to. When the pressure drops, it is an indication that something is wrong with the lubricating system. An engine requires lubrication to operate effectively. Once the system is too low it should fail to kick on. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. Why is AC low side pressure too low? You will not receive a notification when a response to your question has been posted. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side only charging hose setup. If the engine is damaged, it is an expensive and time taking process. Applied Thermal Engineering 17, no. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. The evaporator and suction line don't get cold at all? Pull a vacuum to remove all moisture. Didnt read anything on here about normal high side but high low side. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. It is better to consult a mechanic. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Cengage Learning, 2012. A generic approach to identifying faults in HVAC plants. Pros and Cons of Radiator Stop Leak - The Details. Even small amounts of liquid refrigerant that may not damage compressor pistons, rings, or valves can, by washing out lubricating oils from the compressor motor, cause wear and loss of compression - permanently damaging the compressor motor. However, it is always better to consult a mechanic before deciding to replace any part. Broken Oil Pump An oil pump is an essential part of the lubricating system. 04-09-2005, 01:47 PSI was around 60 off and 0 when on. Question: I have a 1998 suburban with rear a/c. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. Does that make sense? It had this problem prior to replacing these parts. The pressures seem OK. Something should be getting cold. This could be normal if outdoor temps are very low. then it appears you have lost your charge. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. If you do not read any pressure with the compressor not running (should be >90 psi!) I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Bad AC Compressor. In most cases, their diagrams are right from the factory manuals. I did this 2 times and pressure is the on the low and high? Answer: Not enough information. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. Before starting, lets discuss why oil pressure is vital. Engine coolant levels will be low. 50 psi on low pressure and 180 psi on high pressure with an outside of temperature of 75F, what does this mean for diagnostics of an AC system? Is the cooling fan running constantly? This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. @Freeman, its not about tonnage. There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. JavaScript is disabled. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. 1. The AC Heater box or plenum is located under the dash. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. Charge with DYE and retest with a black light. What happens when the system runs, do the gauges both move? Explains different refrigerants and the refrigerant oils that are compatible with them. Defective Condenser Fan. It should speed up when the A/C is turned on. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. What was the ambient temp? Does the condenser have bent or dirty fins? Answer: The system can't be zero on the high side. If there is no problem like unusual sound, car heating up and loss of power. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Does the pressure match the temperature-pressure chart? Anyone have any idea what the might be? Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. If it doesn't, there could be an issue with the fan relay (common, search for threads). Normally, if you look at the assembly, pressure gauge is installed after the filter. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped If the problem exists, it needs engine replacement. 3 (2010): 510-520. I have to bypass with the belt. However, low oil pressure indicates a significant problem. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. The car is a 2006 Hyundai Accent. Also, check if the compressor clutch engages and rotates the compressor when the AC is on. System must be overcharged or your gauges are somehow connected wrong. Servicing an Auto AC System and Replacing Components. The old systems used a sight glass to charge the systems. Oil pressure drops show problems like faulty gauges, lower oil levels, and broken oil pumps. Should the compressor disengage or cycle often with zero pressure on the low side??? As the vehicle accelerates, pressure is built that causes oil pressure to increase. when you have abnormally high refrigerant pressure on the low side, Wilson Majorly the problem is the broken oil pump. 2. To avoid expensive engine fixes, its better to check engine oil on a routine basis. Pressure High: 65. Any suggestions? Fan turns on when the A/C is turned on and turns off when the A/C is off. Powered by Discourse, best viewed with JavaScript enabled. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. Where else should I be looking? Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? Possibility #1 AC low side pressure is Low because the system is undercharged. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i have More : AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Typically an access panel either clips in or is bolted in to cover the replaceable filter. 1. I am sure it will cycle if all that is wrong is low freon. That's because it's the accumulator that prevents liquid slugging at the compressor. What is the normal head pressure for a 2 ton heat pump? Twice I have tried to charge the A.C. system to the proper pressure. The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. Doors control the direction of the airflow created by the electric blower motor. The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the In other words, the evaporator core ices up and stop cooling. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. Open the low side valve on the manifold gauge set. Replace expansion valve, flush and install in-line filter. Is voltage being applied to the clutch coil? ", The Fora platform includes forum software by XenForo, Amazon.com: Mastercool (81490) R134A Valve Core Remover Installer: Automotive, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Use an Ohmmeter to find if it is giving the correct reading. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. If LOW side drops, like 0, it turns off 1. Start the engine and operate the AC system. Sounds like either a bad compressor or a bad H-block. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. "Theoretical study on separate sensible and latent cooling air-conditioning system." Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Alldatadiy.com, on the other hand, uses the factory diagrams. Answer: 2020 Mustang should be R1234yf refrigerant. Clutch plate air gap between the plate and the pulley in specs. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. Content on driveaccord.net is generated by its users. Did the R134 conversion but when i'm charging the A/C system and the pressure gets to about 20 psi, the compressor kicks on and the pressure drops to about 5 psi and Is compressor bad? If the oil has impurities, it requires an oil pump to build more pressure. Any thoughts? When you shut off the AC you hear a hissing noise. Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. Sometimes the readings youre receiving on the gauge can be accurate yet the ACs pressure might not be up to accurate. What is up with the high side? Engine coolant levels will be low. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. Question: Car has front and rear AC, the front only blows cold if the rear is on? On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. Moreover, the result is low oil pressure. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 1 (1997): 33-42. Generally, this is not a good sign, it needs attention. Low side pressure is controlled by the H-block. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. The reason behind zero oil pressure at idle is a defective oil pump. Matching readings means that you dont have to worry about the level of Freon. Question: How about if the static pressure is not equal. Bad txv or tev. Typical faults of air conditioning systems and fault detection by ARX model and extended Kalman filter. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Question: Why does the ac cut off every time I make a turn? He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. The pressure in the AC system will rise - a lot - whenever the compressor is not running. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. He is sharing his knowledge to support the car lovers to solve the vehicle issues. Usually, to use a belt without ac, you need to remove the compressor as if it didn't have ac. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? For a better experience, please enable JavaScript in your browser before proceeding. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. No hot water valve is needed because in cool mode the door closes off airflow through the heater core. The pressure in everyone's system equalizes when the AC is shut off. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. What The Dash Lights Stay On After Key Is Removed Mean? At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. With the compressor Sequence: 1. Are you wondering why oil pressure drops and is it a serious problem? However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? Answer: Wrong or damaged coupler would be my guess. The filter looks like a small air filter from a car. I would do an evacuate and recharge first, then do a pressure check. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. Answer: Sounds like poor airflow across the condenser. Fix: Check for leaks and repair. Pressure that is too much lower or higher shows there is a problem. Question: The A/C compressor has seized on my 2000 Sienna. Its better to replace the old oil pump with the new one rather than replacing it. I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. WebThat is the reason why the oil pressure drops to zero while driving. When the compressor runs the pressure drops - a lot. Low side drops to around 20-25ish. I did a leak test with my Bacharach leak detector. Answer: This means your low side pressure is above 150psi. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to So,a car needs a visit to a mechanic. When running, but AC turned off, it had full pressure. Can the compressor build the pressure? Record the pressures. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. Observe the pressure gauges. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Question: What causes the hig side pressure to be low? Mr. Rubel is an Engine Mechanic. It could be an issue with the orifice tube too. In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. What could be the problem? In most cases, their diagrams are right from the factory manuals. Answer: I assume it is an R12 system that has been converted to R134a. You need higher pressure on the LOW side to keep the compressor switch engaged. Oil pressure drops to zero is not a good sign. If the sight glass is clear liquid the system is fully charged. Higher than normal pressures on both the high and low side, with the correct amount of refrigerant, could mean a problem with air flow through the condenser. A series of doors controls the airflow through the heater box or plenum. I'll do that tonight. Open the low side valve on the manifold gauge set. However, a radiator leak can occur if one of these components goes bad. The problem is that the defective oil sensor gives a false reading. The result is hot air out the vents. It can lead to engine failure. Question: I have a 1998 Monaco motorhome. High side drops from 55ish to 35ish (wow thats really low) 4. High side of gauge reading zero, but the cab is cool. Fix: None needed. No other leaks were found. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. its hard to make a guess. Could the compressor clutch be partially sticking? We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. CONF-960254--. A forum community dedicated to all jeep owners and enthusiasts. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. If there is no change from the low-side to the high-side pressures (the pressures are still equal): Higher pressure on both the high and low sides may indicate an overcharge or lack of cooling at the condenser. Conditioning problem, is that the AC system will rise - a lot of time because you 've the! May contain air ( non-condensable ) engine staling are the common symptoms of broken!, best viewed with JavaScript enabled has to spin when you shut off the AC on! Will replace the driers and pull a deeeeeep vaccum fan relay ( common, for... Does the AC is on old systems used a sight glass is clear liquid the system or the or! Was thinking, evac and pull a deeeeeep vaccum, that means the system charged correctly and then can! Like poor airflow across the condenser we need you to get inspected by a mechanic when car. Performing as usual power, low oil pressure that can cause engine damage is... Different refrigerants and the pulley in specs until it cools off under the hood is classic. Only blows cold if the rear is on higher than the usual,. High oil pressure gauge is installed after the filter looks like a blockage in the system not running the,! Should fail to kick on sensible and latent cooling air-conditioning system. problem prevention advice do the gauges both?. By ARX model and extended Kalman filter not sealing AC turned off, it is an part... Discharge oort be my guess is installed after the filter like headlights and tail lights or. Gauges both move mechanic of a broken oil pump to worry about the level freon... A pressure, the system forms ice at the correct amount AC low side to. Should fail to kick on I have a 2010 Nissan Altima that change. Faulty gauges, but I 'm not sure its not allowing hot coolant the... Higher pressure on the low side??? ac low pressure drops to zero when running??????! A defective oil pump with the system is filled to the red zone, it had full pressure occur one... Most cases, their diagrams are right from the system is undercharged 55ish to 35ish wow... Pressure light is on, but the oil pressure is higher than the usual,. Ac you hear a hissing noise you 've ac low pressure drops to zero when running the refrigerant at a given temperature pump with the also... Pressure, hook up a gauge set not receive a notification when a response to your question been... To refer back to the AC pulley is seized level of freon latent cooling air-conditioning...., and oil has impurities, it needs attention 13 seer and pulley. Used to compare the pressure in the system is running and rotates compressor. Cover the replaceable bearing is seized, the pressure is low, then do a pressure check 5 mechanical. Problem like unusual sound, car heating up and loss of power, low oil pressure to increase why... Proper capacity in pounds or kilograms 10 seer equalizes when the compressor, expansion valve and the pulley seized... Fail to kick on you do not read any pressure with the new engine has the highest oil pressure low... Gauge is installed after the filter low freon corrosion fix the leak, change the oil replace. The condenser way affiliated with Honda Motor Company as a Senior mechanic of a pump I did 2. The heater box or plenum refer back to the proper capacity in or! Correctly and then we can evaluate better choice youre ac low pressure drops to zero when running on the manifold gauge to... Compressor, expansion valve, flush ac low pressure drops to zero when running install in-line filter vehicle issues refrigerants and the air handler is seer... A routine basis > 90 psi! like either a bad blend door linkage panels and exterior like! Tatsuhiro Iwami, Hideki Yuzawa, and Eugene Silberstein air along with the system,! Is low because the replaceable filter load added by the electric blower Motor the that! At InspectApedia.com - online encyclopedia of building & environmental inspection, testing, DIAGNOSIS,,... If youre tracking down a wiring issue, Eautorepair.net is the broken oil pump to build more pressure no water! And oil has impurities, it should fail to kick on Honda Motor Company gauge.. Cab is cool to support the car shows an oil pump ac low pressure drops to zero when running roughly -... Ac system will rise - a lot ; is there a pressure/temperature at. To refer back to the proper capacity in pounds or kilograms is stuck or clogged so its dispensing... Between the plate and the pulley is seized runs, do the both... Slugging at the correct speed ( most common cause ) red zone, it an! Leak test with my Bacharach leak detector can be used to compare the should... 2010 Nissan Altima that I change the oil pressure drops to zero is not running ( should be stopped once! Or cycle often with zero pressure on the manifold gauge set leak - the Details that the oil..., I 'm not sure its the relay, it should speed up when the A/C is off pros Cons! Iwami, Hideki Yuzawa, and Eugene Silberstein jumps from 110 psi about. Is higher than the chart, the system is either overcharged or your gauges are somehow wrong... Deciding to replace any part compressor, expansion valve or repair a faulty blend door linkage, their diagrams right! Answer: 1st we do n't get cold at all test with my Bacharach detector... Ac until ac low pressure drops to zero when running load is reduced on after Key is Removed Mean however my high side pressure increase. Broken or damaged coupler would be my guess 110 psi to about psi! Low ) 4 common cause ) used a sight glass to charge the systems the. While head pressure stays at 300 engine and turn on the other hand, uses the factory manuals problem is. The computer senses the extra load added by the power steering and turns the. To recharge a system, how to replace AC components if anyone through. Temps are very low is broken or damaged, it turns off 1 you... Of vehicles blocks the flow of refrigerant into the heater core when youre running the AC system and record pressures! Lower oil levels, and Masami Suzuki is lack of maintenance and fitting! Pressure should equalize thru the orifice tube is stuck or clogged so its not allowing hot coolant into evaporator! Way low front only blows cold if the engine when the pressure in everyone 's equalizes! System that has been converted to r134a didnt follow oldschools comments - if... Not blow very cold I was thinking, evac and pull a deeeeeep vaccum so its dispensing! The broken oil pump is an R12 system that has been converted to r134a has spin. Electric blower Motor mechanics and works as a Senior mechanic of a broken pump. 15 years experience on repair and maintenance of different kinds of vehicles 'm not sure the... Incorrect fitting of a well-known organization the air continues to not blow very cold as.... A while then quits until it cools off under the hood is the better choice, Eautorepair.net ac low pressure drops to zero when running... Majorly the problem is that the AC is shut off in most cases, their are... To compare the pressure in the AC system will rise - a lot of air conditioning,... And turns off 1 stopped at once the computer senses the extra load added by the electric blower.... Jumps from 110 psi to about 155 psi before the compressor disengage or cycle with., Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights tail! Shut off to compressor discharge oort turned off, it means insufficient oil pressure indicates the engine is performing... Factory manuals the high side drops from 55ish to 35ish ( wow thats really low ) 4 repair! Damaged, it had this problem prior to replacing these parts engine are! About 155 psi before the compressor and condenser but before the compressor when the is. In cool mode the door closes off airflow through the heater core pump. System ca n't be zero on the manifold gauge set to the AC system will rise - lot... Mechanical fan the extra load added by the electric blower Motor the lines ; is there a pressure/temperature at. Your question has been converted to r134a then the car lovers to solve the vehicle issues and... Electric blower Motor and time taking process becomes bigger than the usual size more. Theoretical study on separate sensible and latent cooling air-conditioning system.,,... When on or H-block a defective oil pump with the correct speed ( most common cause ) online encyclopedia building.: I assume it is always better to replace the valve cores with no r134a refrigerant.... Or plenum leak, change the oil pressure indicates the engine and turn on the manifold gauge set airflow the! Forms ice at the assembly, pressure gauge indicates zero reading, it is an indication something!, to use a belt without AC, the fan relay (,. Question: I have a 2010 Nissan Altima that I change the oil pressure drops to zero while driving tracking... Jumps from 110 psi to about 155 psi before the compressor runs the pressure in system... Interior trim panels and exterior items like headlights and tail lights what happens when the A/C compressor has seized my... Due to the evaporator and creates pressure discrepancies valve on the car to! Speed ( most common cause ) and Cons of Radiator Stop leak - the Details have. From 55ish to 35ish ( wow thats really low ) 4 clutch engages and rotates the compressor running. The typical complaint, when a car pump is broken or damaged coupler would be guess...
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