Weird Acting A/C (search no help)
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,401
Likes: 4
From: Birmingham Alabama
Weird Acting A/C (search no help)
I have a 99 vert. First thing in the mornings my A/C works fine.Drive it to work, the car sits in the sun, it will not cool. Park it in a cool spot and it will blow cold air. It refuses to blow cold when you need it most. I changed the ambient temp sensor on the rad support, still didn't help. Too weird. Next morning it's cold again. Heat of the day, no a/c.
Anyone had this problem or have any ideas?
Anyone had this problem or have any ideas?
Safety Car
Joined: Dec 2004
Posts: 3,526
Likes: 20
From: Santa Fe TX
I had this problem on my Nissan truck and it was the compressor clutch. It had just enough clearance so that the voltage wouldn't "throw it" on hot days. On cool days it could keep up fine. Took me forever to figure out what it was. I changed the expansion valve, evaporator, condenser. I just couldn't imagine it being the compressor because it was turning and the gauges showed it was working (compressing the freon). sometimes and I had never seen one fail intermittently like that. One day I finally noticed that it was not turning the compressor at idle and I tapped the end of the compressor and watch the clutch kick in. Took a new compressor clutch combo to fix it though. Changing just the clutch was cost prohibitive.
Other causes could be:
freezing up,
poor condensor/radiator performance
Other causes could be:
freezing up,
poor condensor/radiator performance
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,401
Likes: 4
From: Birmingham Alabama
I just had the freon charged, it was a bit low. It wasn't freezing up and the compressor clutch is engaging. If it were freezing up it wouldn't it blow cold at first before it turns hot? After sitting in the sun, not running, start the car and it immediately blows warm air. Looks like it has something to do with the outside temp or a sensor somewhere. Who knows? I have no faith in our local dealers service depts. I was thinking of wrapping the outside sensor in heat wrap.
