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Old 07-19-2006, 12:01 AM   #1
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Question A few questions by a new owner

I have a few questions that I'm sure you all can help me answer. I just bought an '02 4.0 that I love driving, but when I get up to highway speeds the AC will cut out. This is not a big problem, but I hope it is not something seriously wrong. Also, when I start out from a stand still, sometimes it sounds as if my engine is running at a higher RPM, but the gages show nothing different. Do I need to reset the PCM? I appreciate the help.

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Old 07-19-2006, 10:43 AM   #2
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hope this helps. D

also check this list:



A/C clutch relay DTC present
Refrigeration system not properly charged
High press cut-off switch
Low pressure switch
A/C request circuit open
A/C select circuit open
A/C clutch coil
A/C compressor clutch ground circuit open
A/C clutch relay output circuit open
Fused B(+) circuit open
A/C clutch relay


2001 Jeep Wrangler Sport (Flame red. Bikini top, Hard top, Step bars, 31x10.5 on Cragar Soft 8's, pretty much stock...for now)
2001 Dodge R/T (Loaded)
2001 Dodge R/T - Indy edition (Indy red, Intaked, Braked, Leathered, Powder coated, polished & Exhausted)
1977 Pontiac Astre (chevy powered and overdrived)

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Old 07-19-2006, 11:32 AM   #3

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its it a 5spd or auto? If 5spd, and engine revs but tach not moveing then your clutch may be slipping...
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Old 07-19-2006, 05:59 PM   #4
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[QUOTE=LIL_red_JEEP]hope this helps. D

also check this list:


how do I check all of those?
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Old 07-19-2006, 07:51 PM   #5
coilovers are damn flexy
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I think what is being said to you, rather vaguely, is try to get your A/C system checked out. Sounds like your system is shy a bit of freon.
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Old 07-19-2006, 11:10 PM   #6
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yup you could try checking...your system needs the freon...my dads cars air wasn't workin' very good and we had to put some in to make it colder...dont know if its the same situation with u though
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Old 07-20-2006, 01:41 PM   #7
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So does your A/C cut out completely or does it shift to the floor or the defroster?
Jack Hickman

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Old 07-21-2006, 12:21 AM   #8
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floor and defroster
Grey '02 4.0L

College student who has no money for mods.
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Old 07-25-2006, 12:35 AM   #9
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I've got a '00 XJ with the same problem. It appears there is a short of some sort in the heat/cool control panel. I can turn on the vent for the floor and get both floor and defrost. If I turn on the air conditioning for both floor and dash I may get floor and defrost. The next time I adjust the knob it may be correct. To date I have refused to have the dealer check it because I'm thinking the replacement part (which contains all three knob adjustments) may be more than I'm willing to pay. But, if you have a shortage of freon, you will don't have this problem. The problem you'll have is the air never gets really cold if on max. If it's somehwat cool but not getting really cold you probably have a slow leak. Get a can of freon with sealant, an extra can of just freon and a hose installation kit. Follow the directions and it is really easy to do. My dealer wanted $1,000 to replace the evaporator in the dash because of a leak so I tried this $36 solution. The evaporator sealed, I added the extra freon and it's working great. Hope this helps.
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Old 07-25-2006, 03:49 PM   #10
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alot of older cars do the same thing. venting gets cruded up with mold due the moist environment of the ac unit. flippers don't work right. atleast thats what my mechanic blamed my problem on.

didn't fix it when i found out what it costs to take the thing apart and clean it. and it ain't worth doing myself.

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