Please help! AC blows cold then hot
Thread Starter
3rd Gear
Joined: Sep 2007
Posts: 3
Likes: 0
From: KY
Please help! AC blows cold then hot
The AC on my 1992 blows extremely cold but then randomly switches to warm/hot air even when the snow flake button has a green light. There seems to be no pattern to the switching between cold air and warm air. Any suggestions on what the problem is?
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
Watch the compressor while the engine is running w/ the a/c on coldest. See if the clutch is engaging/disengaging. On mine, the wires going to the coil on the clutch were bare and contacting the compressor housing. When I pressed down on the connector mounted on the compressor, the clutch would engage until it once again shorted.
If that's your problem, Ecklers sells a new connector assembly for about $15. I repaired the wires on the clutch (after removing it) with heat-shrink tubing.
I was having the same symptoms as you....hope that's all it is!
If that's your problem, Ecklers sells a new connector assembly for about $15. I repaired the wires on the clutch (after removing it) with heat-shrink tubing.
I was having the same symptoms as you....hope that's all it is!
Thread Starter
3rd Gear
Joined: Sep 2007
Posts: 3
Likes: 0
From: KY
Watch the compressor while the engine is running w/ the a/c on coldest. See if the clutch is engaging/disengaging. On mine, the wires going to the coil on the clutch were bare and contacting the compressor housing. When I pressed down on the connector mounted on the compressor, the clutch would engage until it once again shorted.
If that's your problem, Ecklers sells a new connector assembly for about $15. I repaired the wires on the clutch (after removing it) with heat-shrink tubing.
I was having the same symptoms as you....hope that's all it is!
If that's your problem, Ecklers sells a new connector assembly for about $15. I repaired the wires on the clutch (after removing it) with heat-shrink tubing.
I was having the same symptoms as you....hope that's all it is!
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Compressor is part of the accessory drive train and spun by the belt. For the LT motors, it's mounted on the left side of the engine and the clutch is on the front of it. With the hood up and the a/c running, you should be able to observe the clutch engage and disengage - if that is in fact what it's doing. It shouldn't be, if it's 70 degrees or better out and the system is fully charged, though the specs are 8 cycles or less - or engagements/disengagements - within 1 minute at this temperature. You can count them while you watch the second hand on your watch if you like.
The '92 actually monitors how frequently this engagement/disengagement thing is going on, and if it happens really fast, it shuts the system down as that is what an a/c system will do if it's low on gas. However, if it's cycling at 70 degrees or better outside, I'd stop by an a/c shop and have it checked out. Takes about 5 minutes and a lot will do it for free because they make a lot more money fixing leaks - and they will want to fix yours if the gas has leaked out.
The '92 actually monitors how frequently this engagement/disengagement thing is going on, and if it happens really fast, it shuts the system down as that is what an a/c system will do if it's low on gas. However, if it's cycling at 70 degrees or better outside, I'd stop by an a/c shop and have it checked out. Takes about 5 minutes and a lot will do it for free because they make a lot more money fixing leaks - and they will want to fix yours if the gas has leaked out.
