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  #1  
Old 06-22-2016, 07:54 PM
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Ac problems

Compresser kicks on for 4 seconds and then off .AC is fully charged but blows out warm air. Anyone have any idea's. Need some advice..2004 GC 4.8L

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  #2  
Old 06-24-2016, 07:09 AM
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Re: Ac problems

The compressor should stay on for a longer period. Best would be to measure the pressures at both ports, to be better able to tell what can be the problem.
Also with the engine cold, there is no cold air from the outlets?
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Old 06-27-2016, 06:31 AM
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Re: Ac problems

Thanks for getting back with me. I checked pressure on the low side after driving the Jeep about a half hour with the air on. The gage was in the green witch is good and then jump into the red witch is danger zone. The needle would go back and forth. One line was so hot that you could barely touch it. The other line was very worm. I timed the clutch on the compresser and it kicks in for 4 seconds and kicks off every time. Thank you for trying to help me.
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Old 06-27-2016, 07:15 AM
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Re: Ac problems

What are the pressure numbers, not just the colors?

Hard to tell without seeing how both the hi and lo side behave, but as a WAG it feels like maybe a bad expansion valve.

This isn't likely to be a DIY repair, though..
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Old 07-01-2016, 05:54 PM
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Re: Ac problems

I will get on the Jeep project Saturday 7/2/2016. Working alot of hours. I will post the pressure readings on the low and high side. I was told around 35 pounds on the low side. Thanks for all your help so far. I relly appreciate all the help.
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Old 07-05-2016, 05:50 PM
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Re: Ac problems

I checked the low pressure side . My gage showed 25 lbs. I have not checked the high side yet. Have to buy a adapter for that fitting.I drove the Jeep for a half hour with the air on high when I got home and checked the pressure.
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Old 07-06-2016, 02:50 PM
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Re: Ac problems

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Originally Posted by HarleyDavidson View Post
I checked the low pressure side . My gage showed 25 lbs. I have not checked the high side yet. Have to buy a adapter for that fitting.I drove the Jeep for a half hour with the air on high when I got home and checked the pressure.
Careful messing with the high side. Wear heavy gloves as you connect and disconnect the fittings.

? Yours doesn't have an old fashioned pressure limit switch at the condensor IIRC.
But it does have a sensor there that will turn the compressor off if it starts misbehaving.

If you have a trusted AC shop that knows your model, might be worth pinging them.
Some dealers are OK, but for AC stuff I've found the independent specialists tend to be aware of more quirks.
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Old 07-06-2016, 07:02 PM
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Re: Ac problems

Thanks everyone for helping me out. Much appreciated. I do know such a person. I will give him a ping to see if he could help me out. I will let everyone know how it turns out.
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Old 07-08-2016, 12:42 AM
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Re: Ac problems

The low side pressure is a bit at the low side. Normally it should be between the 35 and 40 psi. This could well be a problem with a too low charge.
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Old 07-08-2016, 05:43 AM
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Re: Ac problems

25psi low side with the compressor running is OK-ish.. Need to see both the lo and hi side with the compressor running to start to diagnose.. your AC shop guy can do this correctly..
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  #11  
Old 07-08-2016, 09:57 AM
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Re: Ac problems

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Originally Posted by tomk View Post
25psi low side with the compressor running is OK-ish.. Need to see both the lo and hi side with the compressor running to start to diagnose.. your AC shop guy can do this correctly..
This is not what the manual is stating, it says in between 35 and 40 psi.
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  #12  
Old 07-09-2016, 05:46 AM
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Re: Ac problems

Quote:
Originally Posted by Frango100 View Post
This is not what the manual is stating, it says in between 35 and 40 psi.
That should depend on temperature.
For an R134a system 35-40 is reasonable at 90F+, but is high at 80F or below. Can you clip the performance chart out of the service manual?
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