Question about 2004 Jeep Grand Cherokee

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AC Cuts out on 2004 Jeep Grand Cherokee

The system is charged (plenty of freon).

When I start the Jeep and turn on AC it works just fine. Depending on how hot and humid it is outside the AC will just cut out (blower remains on but no cold air). If I turn the AC off for 15 mins to half an hour I get cold air again; however, it only runs for a while and I lose the cold air. I'm pretty sure the AC Clutch is engaged throughout this entire process.

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  • Jeffler42 Jun 17, 2009

    Kevin - Sorry for the ambiguity. When I shut the AC off, Blower goes off, compressor disengages (i.e. normal shut down). When the system is on the compressor seems to remain engaged even when I'm getting no cold air. - Jeff

  • Jeffler42 Jun 17, 2009

    Please review the thread. I need assistance soon. To clarify, the AC Compressor seems to remain engaged the whole time the AC is switched on.

  • Jeffler42 Jun 18, 2009

    OK the first guy didn't reply after I clarified the question, apparently the second guy didn't read that I confirmed that the system was fully charged, Anybody else want to try?

  • Jeffler42 Jun 18, 2009

    While riding around in my Jeep sweating profusely I said to myself, "there's something wrong with my air conditioner, maybe I should have a mechanic fix it". Before doing that I thought I'd check into what FixVa had to offer. I came to this site to find an individual that has seen similar symptoms in the AC in other Jeeps and feels he KNOWS or at least may have an idea what is wrong with my AC. If I wanted to pay a mechanic to diagnose the problem, I'd have done that in the first place.

  • Jeffler42 Jun 19, 2009

    Thundergod - Thanks for an informed reply. The weather has been mild so my problem hasn't been presenting; however warmer weather is predicted so the next time the problem occurs, I'll pull over and confirm that the clutch is engaged. In the mean time, the last time the problem occurred, I saw some vapor blowing into the car through the AC vents. It was a humid day. I look forward to working with you. - Jeff

  • Jeffler42 Jun 20, 2009

    Don't bother to reply that my coolant is low. The first line of the first post says that the system is fully charged. Pressure was checked and is holding, no indication of leaks. If anything, it may be very slightly over full. When the system is making cold air, it's really cold, when it cuts out the air coming out of the vents is at or nearly at the ambient temp. Also when it cuts out, the compressor clutch is engaged but the low pressure and high pressure tubes running from the compressor are both warm. When the air coming from the vents is cold, the compressor lines are cold on one side and hot on the other.

  • Jeffler42 Jun 20, 2009

    Thundergod - Checked yesterday - Compressor clutch IS engaged; however, low pressure and high pressure tubes are the same temp after the cool air cuts out in the cabin. When the AC is running normally the LP side is very cold and the high pressure side is hot (as you'd expect. I just drove the Jeep from Baltimore to Philadelphia and the AC Remained on and cool the entire time. I kept my eye on the temp gauge and the coolant temp in the radiator ranged from 205 to 209 (never touched the 210 mark). I'm replying to you since you are the only reply that wasn't giving me general AC trouble shooting answers. You actually considered the model of vehicle into the equasion.

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Hi: There will be a drain from the evaporator ( the part that freezes for your cold air) If it is clogged the ice will back up and stop the cooling. This is especially prevelant in an area with high humidity. If you are in a high humidity area and run it continously at the highest setting this will also happen. Set the cold control in the middle and see what happens. If it is working correctly you will see a puddle of water under the Jeep when you stop. I hope this helps, Jeff.

Posted on Jun 21, 2009

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The radiator fan is not pulling enough check the belt tension.
make sure you have enough air cooling the condensor.
check the fan clutch make sure its not lame and loose.
if the radiator fans are electric make sure the fuses are good and make sure the fan motors are working and turning on with ac call.














Posted on Jun 20, 2009

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I read your posts and keep getting "hung up" on that you say the compressor "seems" to be staying on...That's such a critical part of the problem that "seems" does not work for me. I've got a 97 sitting outside right now that is doing essentially the same thing...but the compressor is NOT staying engaged. (I know this because I looked at it.) However, there is 12v at the power lead to the compressor. One thing I noticed that disturbs me is that there is no independent ground wire and the clutch coil is separate from any other ground source. The ground wire is attached to the aluminum bracket, which being a dissimilar metal than the wire end, is prone to electrical corrosion. If it was not raining right now, I would already have cleaned that contact and/or connected it to a more reliable ground. What I believe is that since the clutch requires a large amount of amperage to stay engaged, it runs for a while then breaks contact. (as I said, if it were not raining, I'd have a definite "lock" on this as something more than an informed theory.)
Your problem could be also caused by a bad high or low pressure sensor, but you need to do some testing for verification.

Posted on Jun 18, 2009

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The compressor will "cycle" on and off if the refrigerant level is getting low. There is a sensor that detects the pressure of the refrigerant on the "low" side. If there is enough pressure, the compressor can turn on. When the compressor pulls some of the refrigerant and compresses it to the "high" side, there will be less refrigerant for the low side, which causes the sensor to turn the compressor off again, then the refrigerant migrates back to the low side and the compressor can cycle back on.
Once the refrigerant level gets so low that the sensor won't allow it to turn on, you're done. You need to find the leak, repair it and recharge the system. Most AC systems that leak that fast have a worn seal and/or main shaft bearing in the compressor. You can't really repair a compressor so if that's your problem, just plan on getting a new one.
Look at the compressor, around the pulley. If you see oil, that's your leak.

Posted on Jun 19, 2009

  • vijay A Jun 19, 2009

    u may also have a check at the sensor which senses the refrigrant level

  • vijay A Jun 19, 2009

    even if u have full refrigrant level the sensor malfunction may lead to this problem
    are u satisfied with my answer?

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Ok what your jeep is doing is there is something defective or broken with your AC unit that is why it shuts off. What you need to do is take it into a repair shop and get your AC replaced/repaired!

Posted on Jun 18, 2009

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You need refilling the gas within the a/c system.I don't think there is anything else wrong here.They call it regasing..or somethiing like that..

Posted on Jun 17, 2009

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Just need to clarify. You mean the AC remains engaged and you get cold air, when you have already switched off the AC?
Let me know i got you correct?

Waiting for your reply.
Thanks
K

Posted on Jun 17, 2009

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