A/C Problem - North American Grand Cherokee Association

Mrfreeze5 · 07-22-2002, 12:39 PM

I got in my ZJ today at the store and pulled out of the parking lot and noticed it was really hot in there. Turns out the AC wasnt blowing cold air and I noticed the check engine light was on. So I stopped, turned the truck off, turned it back on and voila! AC again. It's never done this before and I haven't had it happen since. It this a sign of a worse problem to come? Or was my jeep just pissed at having to drive in this ridiculous heat?

07-25-2002, 07:26 AM

A/C clutch maybe? I ended up with a couple extras by accident, if you end up needing one you can have it if you pay shipping

Kornchild · 07-29-2002, 08:08 PM

What woudl be a good indication the clutch is going? My AC runs but kinda whines at me that I can feel, also when I increase the RPM's the whine gets worse, its the type of whine you can feel. I know its teh AC cause if I shut it off, the whining stops immediately I am wondering if its teh ac compressor or if maybe my belt is just shot and sliping when the extra stress is put on it? Any idea's?
Kornchild

gtmtnbkr14 · 07-30-2002, 07:22 AM

Just recently mine started acting up too. I was driving for about 45 min in 90 degree weather and all of a sudden it stopped blowing out of the floor and main ducts. It would only come out of the defrost vents below the windsheild. I turned it off and started the jeep up the next mourninhg and it was okand have not had a problem since then.

ANy ideas, or was the jeep pissed or something?

Jonathan

Mrfreeze5 · 07-30-2002, 08:32 AM

I had the exact same thing happen on my trip a few days ago. It stopped blowing out of the vents and started on the defrost vent. Isn't there a sensor on the AC controls or something like that? I thought maybe that might have been the problem b/c since it was still blowing out of the top vents it couldn't be the blower... :crazy

JeepChute · 07-30-2002, 09:38 AM

I had this happen also. It only happened when the selector wasn't on the coldest setting. I thought that it hit a thermostat that said it was cold enough and was just blowing a little to maintain the temp (wouldn't that be a nice feature).

Is this what happened?

-Adam

lkfoster · 07-30-2002, 02:25 PM

Don't know why you'd have no AC one cycle and then have it come back the next.

If the air diverts from the face vents to the defrost there's a vacuum leak somewhere in the actuator circuit. Engine vacuum activates various diaphragms that move baffles to switch things around. Look for leaks or a bad check valve under the hood (if you're lucky) or behind the dash.

wax · 07-31-2002, 09:29 AM

In some vehicles the computer senses a low vacuum condition and for safty reasons switches the system to defrost so you can see where you are going. According to my dealer.. :roll: .. Don S..

Scheme31 · 07-17-2003, 05:39 PM

Quote:

Originally Posted by lkfoster

Don't know why you'd have no AC one cycle and then have it come back the next.

If the air diverts from the face vents to the defrost there's a vacuum leak somewhere in the actuator circuit. Engine vacuum activates various diaphragms that move baffles to switch things around. Look for leaks or a bad check valve under the hood (if you're lucky) or behind the dash.

OK, I may sound like a newbie but oh well... Where are these things you say to check? Any help would be appreciated..

grand94jeep · 07-17-2003, 09:31 PM

Jeez, my Jeep did the same thing. I had it for 3 years now and this is the first year this has ever happened. It'll be blowing cold air and then all of a sudden nothing. I turn the vent selector switch off and back on again and it works fine. The funny thing is, it'll work just fine on heat, but not when on cool....weird :spank:

07-22-2002, 12:39 PM	#1
Mrfreeze5 Senior Member Grand Master Join Date: Jun 2002 Location: Denver, Co Posts: 1,093	A/C Problem I got in my ZJ today at the store and pulled out of the parking lot and noticed it was really hot in there. Turns out the AC wasnt blowing cold air and I noticed the check engine light was on. So I stopped, turned the truck off, turned it back on and voila! AC again. It's never done this before and I haven't had it happen since. It this a sign of a worse problem to come? Or was my jeep just pissed at having to drive in this ridiculous heat? __________________ 96 GC Laredo

07-30-2002, 08:32 AM	#5
Mrfreeze5 Senior Member Grand Master Join Date: Jun 2002 Location: Denver, Co Posts: 1,093	I had the exact same thing happen on my trip a few days ago. It stopped blowing out of the vents and started on the defrost vent. Isn't there a sensor on the AC controls or something like that? I thought maybe that might have been the problem b/c since it was still blowing out of the top vents it couldn't be the blower... :crazy __________________ 96 GC Laredo

07-30-2002, 09:38 AM	#6
JeepChute Member Grand Rookie Join Date: May 2002 Location: Worcester, MA Posts: 38	A/C Stopping I had this happen also. It only happened when the selector wasn't on the coldest setting. I thought that it hit a thermostat that said it was cold enough and was just blowing a little to maintain the temp (wouldn't that be a nice feature). Is this what happened? -Adam

07-30-2002, 02:25 PM	#7
lkfoster Junior Member Grand Rookie Join Date: Jun 2002 Location: Surprise, AZ Posts: 8	Don't know why you'd have no AC one cycle and then have it come back the next. If the air diverts from the face vents to the defrost there's a vacuum leak somewhere in the actuator circuit. Engine vacuum activates various diaphragms that move baffles to switch things around. Look for leaks or a bad check valve under the hood (if you're lucky) or behind the dash. __________________ L.K. Foster Surprise, AZ '95 ZJ Orvis 5.2 with stuff

07-17-2003, 09:31 PM	#10
grand94jeep Senior Member Grand Addict Join Date: Feb 2003 Location: Asheboro, NC Posts: 889	A/C Jeez, my Jeep did the same thing. I had it for 3 years now and this is the first year this has ever happened. It'll be blowing cold air and then all of a sudden nothing. I turn the vent selector switch off and back on again and it works fine. The funny thing is, it'll work just fine on heat, but not when on cool....weird :spank: __________________ 94 ZJ, Rack, 4" lift, ES9000's, 31x11.50r15 A/T's, 318 V-8, Flowmaster 40, NP 249, 4.56 gears. http://community.webshots.com/user/grand94jeep

07-25-2002, 07:26 AM	#2
Guest Posts: n/a	A/C clutch maybe? I ended up with a couple extras by accident, if you end up needing one you can have it if you pay shipping

07-29-2002, 08:08 PM	#3
Kornchild Member Grand Rookie Join Date: Jan 2002 Posts: 93	What woudl be a good indication the clutch is going? My AC runs but kinda whines at me that I can feel, also when I increase the RPM's the whine gets worse, its the type of whine you can feel. I know its teh AC cause if I shut it off, the whining stops immediately I am wondering if its teh ac compressor or if maybe my belt is just shot and sliping when the extra stress is put on it? Any idea's? Kornchild

07-30-2002, 07:22 AM	#4
gtmtnbkr14 Senior Member Grand Junkie Join Date: Mar 2002 Location: Rochester, NY Posts: 400	Just recently mine started acting up too. I was driving for about 45 min in 90 degree weather and all of a sudden it stopped blowing out of the floor and main ducts. It would only come out of the defrost vents below the windsheild. I turned it off and started the jeep up the next mourninhg and it was okand have not had a problem since then. ANy ideas, or was the jeep pissed or something? Jonathan

07-31-2002, 09:29 AM	#8
wax Senior Member Grand Junkie Join Date: Jan 2002 Location: Burleson TX (Ft Worth) Posts: 236	In some vehicles the computer senses a low vacuum condition and for safty reasons switches the system to defrost so you can see where you are going. According to my dealer.. :roll: .. Don S..

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