Question about 1997 Jeep Grand Cherokee

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AC Cooling problem

AC compressor is operating OK and Clutch pulley is turning. Freon is charged to capacity. All lines are ice cold. At initial startup the air is very cold as it should be. After a little while the air is warm. Someone suggested that where the lines come into the passenger area, there are two "doors"-one for AC and one for heat. They said the AC "door" is stuck closed. Does that sound reasonable? I have checked fuses and they are all OK. I read about an AC bypass switch. Can anyone help with some advice?

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Well the blend door theory would work if the ac never got cold. But you say it starts out cold and then gets hot.
Its possible the system is freezing up due to lack of air flow thru the evaporator, or a blockage in the freon lines.
You would need to watch the high and low pressure gauge readings as the system gets warm.
You may need professional help for this.

Posted on Jul 17, 2013

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I have Ford expedition model 2001 I replace Ac compressor filter and rear expansion but no cooling why


Did you charge it with the proper amount of freon? Is the ac clutch engaging? One of the ac lines should be cold, is it? Check the freon level to make sure that you don't have a leak. You should have pulled a vacuum on the system after replacing the compressor. This would have shown if there was a leak and removed the air in it so the coolant can be added.

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My a/c compressor is only blowing hot air when I turn it on. I know a little about cars so I know it's the a/c but I am not able to find one on any site that may sell used or new.


If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

Aug 31, 2011 | 1998 Lexus Gs 400

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My AC is having trouble. It seems to only work once out of every 50 times I have tried to run it. I checked the freon with a AC gauge I bought and followed the instructions and it said the levels were up...


Hi, first of all, you will want to verify that your compressor is kicking on. Open hood and located A/C compressor. Have a helper start the engine and and then turn on A/C to maximum with blower at full speed. See if you hear and observe the compressor kick on. The outer portion of the compressor outside the pulley is the clutch. It should make a click and begin to spin along with the pulley. If it kicks on ok, does your cooling fan at the radiator kick on also? May need to run the engine a few minutes to verify that. If so and you are reading a full charge at the low pressure port at this time, you have air in the system and it should be completely emptied and then re-filled with around 3 LBS of R134a refrigerant until you read a low pressure side of 45-50 PSI. Then you will be blowing cold air.
Please rate this answer! Thanks, Mike

Jun 14, 2011 | 1999 Jeep Cherokee

1 Answer

Looks like a faceplate or some sort of front cover on the ac compressor looks like it broke free. Possibly bolts snapped off?


The ac compressor has a clutch on the front end where the belt pulley runs. When the ac is off the clutch disengages and the compressor stops running. The pulley will continue to turn with the engine. If the belt is running normally and that pulley is turning normally along with the other accessories on the belt, it may not be broken, just that the clutch is disengaged. If it is still in place and spinning then your clutch is probably not broken, but more likely you are low on freon. When the freon is low a switch tells the compressor not to come on, and only the pulley will turn. Your ac will not get cold. There may also be other reasons the clutch won't pull in, such as fuses and such.

Sep 22, 2010 | 1993 Buick Regal

1 Answer

Compressor will not engage



Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

May 29, 2010 | 2006 GMC Envoy

2 Answers

Air condition is not cooling my honday civic lx 96? I bougth a freon's cane and hook it up but the freon doesn't get transfer into the car?what I am missing?


you need to put a pressure gauge on the freon input nozzle and see how much freon is already in your system You are probably getting no cooling because the clutch on the front of the A/C compressor is broken, or the switch on the dash is not opening the vents inside correctly. Putting more freon into an already full system can have unpleasant results. So if when checking the gauge, the freon levels are ok, next, run the car, and look at the front of the A/C compressor.see if the clutch clicks in and out as the A/C is turned on/off. If the clutch free-spins all the time it needs to be replaced, or if its silent completely, the wiring to the A/C needs to be checked. If the clutch is ok, head under the dash ad listen for the vent doors opening and closing as you cycle the A/C on/off. If you can't hear them, a vacuum pipe or electrical connection/A/C switch is to blame.

May 26, 2010 | 2003 Honda Civic

1 Answer

A/C turns off during operation


I encountered a similar problem not long ago, though it was a freon issue and discovered that it was something totally different when the low port reading was 125psi. Confused at the reading, and inexperienced with AC systems I sought secondary opinions, and disovered a solution to my particular issue. The compressor clutch was not engaging due to a faulty relay, thus the system was not cooling--hence the buildup of pressure on the low port line. Truthfully, there could be a number of things causing your AC to act up, here are some of the things to check first & foremost:

1. AC Compressor Control Relay (defined as "M/G CLT" or Magnetic Clutch Relay) may be failing. This can be located in the electrical box to the right of the battery under the hood.

Turn the car on, set the AC to MAX and let it run for a while. While facing the front of the car, look under the hood on the left side of the engine. Straight down in front you will see the AC Compressor. There is a belt spinning a pulley, and a clutch assembly within that pulley which engages the compressor. Use a flashlight to see if the clutch is engaging. If you find that it cycles on and off, then you could possibly be a bit low on freon..

If you've checked the freon and it's within range, then try swapping the "FOG" relay with the "M/G CLT" relay (DO NOT DO THIS WHILE THE VEHICLE IS RUNNING). After the swap, start the vehicle and set the AC on MAX. Inspect the compressor again to see if the clutch is engaged. If your clutch was not engaging on your prior freon psi check, then check it again while the clutch is engaged and the system is cooling--this will give you the proper reading for your freon levels. If this solves your problem, DO NOT leave the FOG relay in place of the M/G CLT relay. Go to an auto parts store and purchase a new relay--OEM costs about $70.00, standard replacements (which I happen to have part numbers for.. AdvanceAuto: #R6034, or #35874. NAPA: #TEM207703, or ECHAR6034. AutoZone: #MT0610. O'Reilly Auto: #35874) run anywhere from $14.00 to $30.00 depending on where you go, and what quality/warranty you desire.

2. AC Compressor -or- comp clutch may be failing. If the air comes on and cools intermittently and the relay is functioning, then it may be a problem with a slipping belt. Check your tensioner on your serpentine, as well as the belt. Make sure there are no cracks in the belt and that it is tight along its route.

If neither the relay nor the belt are the cause of your problem, then you may possibly want to have your system purged, flushed/cleaned, and recharged... this is the more expensive part of maintaining an AC system.

Hope that solves your problem!

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1 Answer

The AC is not cooling and when I check the clutch on the compressor it isn't engaging and turning the compressor.


You must of lost freon and when there is no freon your clutch will not activate.Must check it for pressure in the lines.If there is pressure check pressure switch.Good luck let me know

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Well Bruno it sounds like you lost freon from your a/c system.The cabin filter wont restrict you from getting cold air.Check that your a/c clutch engages when you turn it on.if it dont you need freon and have to check for leaks

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