94 a/c issue
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
94 a/c issue
My 1994 with manual a/c just crapped out all of a sudden. I used just a little heat last Saturday night, and flipped it back to cool today for the first time. Nothing but warm air. Leads me to think it's not a leak, since it's worked fine up until now. Any ideas or leads would be appreciated; I'm a bit of a newbie to the C4 world. And to think one reason I picked this car was because of the manual air; figured there would be less headaches to deal with. So much for that line of reasoning, lol.
Drifting
Joined: Jul 2007
Posts: 1,365
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My 1994 with manual a/c just crapped out all of a sudden. I used just a little heat last Saturday night, and flipped it back to cool today for the first time. Nothing but warm air. Leads me to think it's not a leak, since it's worked fine up until now. Any ideas or leads would be appreciated; I'm a bit of a newbie to the C4 world. And to think one reason I picked this car was because of the manual air; figured there would be less headaches to deal with. So much for that line of reasoning, lol.
Race Director
Joined: Apr 2010
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From: Tokyo
Compressor
http://www.superchevy.com/how-to/vem...-conditioning/
ANY HVAC issue will more than likely NOT be a home remedy fix.
http://www.superchevy.com/how-to/vem...-conditioning/
ANY HVAC issue will more than likely NOT be a home remedy fix.
Burning Brakes
Joined: Apr 2011
Posts: 917
Likes: 25
From: College Station Tx
My 1994 with manual a/c just crapped out all of a sudden. I used just a little heat last Saturday night, and flipped it back to cool today for the first time. Nothing but warm air. Leads me to think it's not a leak, since it's worked fine up until now. Any ideas or leads would be appreciated; I'm a bit of a newbie to the C4 world. And to think one reason I picked this car was because of the manual air; figured there would be less headaches to deal with. So much for that line of reasoning, lol.
Instructor
Joined: Apr 2013
Posts: 205
Likes: 1
From: Dayton Ohio
Not really familiar with manual a/c, but the basic premise for cooling air is the same for all a/c. First, as already pointed out, make sure the compressor clutch is energizing. Going from heat to a/c and a/c suddenly not working makes me think there may be an issue with the controller.
To find out if your valve is bad, buy a can of R-134, attach it to the port and press the trigger. When you remove it from the valve, if it is free flowing out, you know you have a bad valve. Hope it helps. Worth a shot to find out.
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Race Director
Joined: Apr 2002
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From: Anaheim CA
Note that you can test the A/C compressor clutch when the engine is not running. It makes a loud click when it engages so it will be easy to tell when that happens.
I would start with the low pressure switch. Unplug the connector and jumper the contacts in the connector. The compressor should engage when you do that.
I would start with the low pressure switch. Unplug the connector and jumper the contacts in the connector. The compressor should engage when you do that.
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Well, the clutch isn't kicking in to the compressor. I'm hoping it might be a switch or something, since it was cooling up until the past few days. I think it rules out a stuck door in the dash as well.
Thread Starter
Racer
Joined: Jul 2013
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From: Florence ALABAMA
Race Director
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Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Checked it today by jumping the connector that hooks to the low pressure switch. When I did that, the compressor kicked on when I started the car and turned it on. However, the air never got cold. Does this indicate a leak AND a bad switch as well?