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Jeep Grand Cherokee A/C Heating Ventilation

371 messages,  Last post on Oct 27, 2009 at 2:04 PM

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What is this discussion about? Jeep Grand Cherokee, Heating / Cooling, SUV

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#352 of 371 No AC in a 2000 Jeep Grand Cherokee LTD codes 54 56 by danielbaute Aug 17, 2009 (1:53 pm)
This is my wifes jeep... she was driving it on a very hot day recently according to her everything was working fine when all the sudden the fan stopped working. I found several posts about this problem that said to check the wiring harness at the fan controller/check for voltage/etc... the wire connector was slightly burnt and I could not remove the connector. Trip to the junk yard yielded a new fan controller and fan for a decent price and after replacing the parts it worked. However the AC wouldn't work. After reading more posts the common problem would seem to be a broken blend door, after running the diagnostics I got error codes 54 and 56 which are both door travel codes. So I got the new blend door repair kit from the dealer as the parts had all been removed on the jeeps at the junk yard and tore the dash out of her car down to the heater housing. I now have the dash completely out and I can see 3 of the 4 blend doors on the heater housing and none of the ones i can see are broken. I'm also unsure as to why the AC compressor will not turn on. I have a 99 grand Cherokee and I have tried the auto temp control panel from my jeep in her hers and receive the same codes when I put it in hers and no codes when its in mine. I've checked all the fuses under the dash as well as the fuse/relay box under the hood. I even swapped the ac relay with the horn relay and I still cannot get the compressor to run. I'm to the point I guess I need to remove the heater housing but I'm afraid i'm missing something simple. Does anyone have any suggestions? Replies to this message: danielbaute (Sep 18, 2009 2:51 pm)
#353 of 371 Re: '99 Grand Cherokee AC compressor clutch [sethybob] by sethybob Aug 17, 2009 (6:21 pm)
Replying to: sethybob (Jul 01, 2009 10:38 am) I removed the front portion of the clutch assembly which can be removed by simply removing the 10mm bolt. There is a washer behind this assembly that can be removed to move the clutch face closer together. Works great now.
#354 of 371 Re: 2001 Jeep GC Limited AC only blowing hot air [danierob] by compton3 Aug 18, 2009 (4:25 pm)
Replying to: danierob (Jul 04, 2009 12:38 am) maybe the press switch on the low side the clicking was the clutch on com. working and the presure sould be in 100s when the compresure in not working or 40 to 60 when full and running   good luck
#355 of 371 Re: air conditioning problem [paulsk] by matt73 Aug 19, 2009 (2:38 am)
Replying to: paulsk (Jun 28, 2007 3:53 pm) Can anyone tell me where the cabin air filter is on a 2001 JGC Replies to this message: topat46 (Aug 19, 2009 3:00 am)
#356 of 371 Re: air conditioning problem [matt73] by topat46 Aug 19, 2009 (3:00 am)
Replying to: matt73 (Aug 19, 2009 2:38 am) http://www.wjjeeps.com/cabinair.htm Not all GC's have them. Click on the attached link.
#357 of 371 Re: Defrost Only [socaldon] by jdeaton Sep 06, 2009 (12:14 pm)
Replying to: socaldon (Jul 27, 2009 9:06 am) I have the same problem on my 01 Cherokee. Have you found the answer? Replies to this message: socaldon (Sep 06, 2009 6:40 pm)
#358 of 371 Re: Defrost Only [jdeaton] by socaldon Sep 06, 2009 (6:40 pm)
Replying to: jdeaton (Sep 06, 2009 12:14 pm) Yes - it was posted in another part of the forum. There is a vacuum tube which you may see going from under the battery toward the firewall which then turns right toward the engine. Then a smaller tube turns left and goes to the ventilation control on the dashboard.   Find out where it has broken and fix it! Now have all the cold air I can handle.   Good luck!
#359 of 371 Grand Cherokee AC problems by redtop2 Sep 07, 2009 (1:28 pm)
Nope - and the dealer keeps saying it's "normal". I've had people tell me the compressor motor will wear out quickly from the start and stop, but without the guy who made the repairs acknowledging it's a problem, don't know what to do - except vow to never get another Chrysler or jeep. We've had AC problems with every single one of them, and it's cost us a bunch of money. And they wonder why we don't buy American anymore...look what it does to us!!! We've never bought foreign yet, but that's probably going to change, as my husband is too tall for the Chevy and GMC SUV's - not enough headroom for him. We'll try them again next time - maybe they've made changes. Really frustrating - we hoped to keep this one until it died.
#360 of 371 Re: No AC in a 2000 Jeep Grand Cherokee LTD codes 54 56 [danielbaute] by danielbaute Sep 18, 2009 (2:51 pm)
Replying to: danielbaute (Aug 17, 2009 1:53 pm) I found my problems... The issue was 2 fold... first the reason the compressor wouldn't kick on was that the car had a major ac leak (there is a pressure sensor that keeps the compressor off when there is not enough pressure in the system) and secondly the blend door towards the firewall that I couldn't see was actually broken per the stored codes in the ac control panel. The car has had a small leak for a while now and we've had to charge it about every spring for the past 2-3 years. We just charged it in late May so I didn't think it had time to leak out as its been almost as predictable as old faithful in about once a year but apparently the leak became really bad really fast. Thankfully the last time I charged the system I installed the UV dye freon and when I had the heater housing out to replace the broken blend door I checked the evap coil with a UV light and the special yellow goggles, it lit up like a Christmas tree. So how or why I had 3 simultaneous part failures or at least 3 within a very short period of time I do not know but now the whole system is up and running great. I will say I'm not a professional auto mechanic, I am very mechanically inclined however but removing the dash was fairly difficult and took the better part of a full Saturday and night to remove it and replace the parts and reinstall the dash. I actually took a couple weeks in real time because I had to get the evap coil and it took a while to get re motivated again but I saved myself, I'm assuming close to a grand over having the dealership fix this problem. I've read reports between $1,000 and 1,500 from the dealer for just the labor on this type of job so I feel accomplished and it's working great.
#361 of 371 2000 Grand Cherokee AC Problems Please Help!! by jthunt89 Sep 19, 2009 (8:30 pm)
I'm at the end of my rope and really need some help. My wife who is 5 months pregnant has a 2000 grand cherokee and the AC doesn't work. We took it to the local garage two months ago and they diagnosed the condenser fan was broke. We had that fixed ($500). Then a week later the AC was blowing hot again and we brought it back to them and they said it was the wiring harness for the fan that wasn't working so they clipped off the end and made a better connection. That worked for another week. After which I brought it to the Jeep dealership and had them diagnose it and they said it was the evaporator and we had that replaced ($1200). That worked for three weeks and then we brought it back to them and they said that the pressure was too high (375 lbs should be no more than 270 lbs) so they fixed that and that lasted for another week (no charge). We brought the GC back in today and they said there is a leak in one of the lines and to replace it is $400. They asked if I wanted them to order the part and I picked up the GC and said I would get back to them. I really can't believe this. Please help!! Replies to this message: shelley91935 (Sep 20, 2009 7:43 pm)

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