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Old 09-07-2012, 01:47 PM   #1
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AC Question

'98 TJ, 4.0L, Factory air, no previous problems.

Recently AC not blowing cold air WHEN IDLING. When moving, out on highway, etc., cools great. Stop at red light and it blows warm air. Checked freon with gauge, initially showed 40 psi then as compressor cycled, swung between 55 and 67 psi. If anything, pressure seems a tad high but freon has never been added. Wife is wanting something done. Can anybody steer me in the right direction?

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Old 09-07-2012, 02:53 PM   #2
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Check your fan clutch. Would help if you new what your high side pressure was doing.

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Old 09-07-2012, 04:51 PM   #3
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Your static pressure looks low so you could have a low charge and/or leak... unless you checked it when it was 40* outside. The low side looks decent what was the high?
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Old 09-08-2012, 08:56 AM   #4
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i am having same problem 50 on gauge 35 high side. The warmer it is outside the worse my problem gets. Checked for leaks and found nothing. I even vacced system and reinstalled freon and am still having same problem
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Old 09-08-2012, 01:35 PM   #5
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Originally Posted by crewchief9 View Post
i am having same problem 50 on gauge 35 high side. The warmer it is outside the worse my problem gets. Checked for leaks and found nothing. I even vacced system and reinstalled freon and am still having same problem
We are in mountains of NM right now and the highest the temp. is getting is low 80s, not near the problem it is at home (Central Texas) where 100+ temps are the norm and the AC blows warm air while idling. Never a problem on the highway. I bought a can of freon but haven't added it yet because I'm still trying to figure what the problem is. Been investigating the fan clutch among other things. Fan clutch replacement doesn't look too difficult but cost of part is high ($350+)
Thanks for all replies!
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Old 09-08-2012, 08:11 PM   #6
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Open your doors wide open when it is the hottest part of the day. That is the best way to check pressures. Check both the high side and low side. Harbour Freight is having a sale right now and you can get a set of gauges for $50-60. You will be able to narrow things down more with a high and low side reading. Otherwise it's just guesswork
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Old 09-08-2012, 08:13 PM   #7
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So you are currently in a much warmer climate and expect your ac to cool just as well while idling? It might be possible if you have a txv but generally your ac condenser coil will be able to reject more heat while moving
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Old 09-08-2012, 08:16 PM   #8
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Quote:
Originally Posted by SeVeReDiStOrTiOn
Your static pressure looks low so you could have a low charge and/or leak... unless you checked it when it was 40* outside. The low side looks decent what was the high?
When talking about static pressure with an AC unit it typically refers to the pressures in the supply and return ducts measured in inches of water column.
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Old 09-08-2012, 10:36 PM   #9
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Quote:
Originally Posted by rtread View Post
'98 TJ, 4.0L, Factory air, no previous problems.

Recently AC not blowing cold air WHEN IDLING. When moving, out on highway, etc., cools great. Stop at red light and it blows warm air. Checked freon with gauge, initially showed 40 psi then as compressor cycled, swung between 55 and 67 psi. If anything, pressure seems a tad high but freon has never been added. Wife is wanting something done. Can anybody steer me in the right direction?
You should be reading 32-41 on your low side, and 200-260 on the high (measured at idle with a/c on max cool).
Since your pressure increases when the air conditioner is engaged, I assume your compressor clutch is working.
I'm leaning more toward bad compressor, but a high side reading would be helpful.
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Old 09-08-2012, 10:40 PM   #10
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Originally Posted by crewchief9 View Post
i am having same problem 50 on gauge 35 high side. The warmer it is outside the worse my problem gets. Checked for leaks and found nothing. I even vacced system and reinstalled freon and am still having same problem
This seems like a probable malfunctioning compressor.
Does the compressor seem noisy when it is running? Is the clutch engaging?

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