Heater/AC switch
Thread Starter
3rd Gear
Joined: Jul 2007
Posts: 3
Likes: 0
Heater/AC switch
This is my 1st post. Im a new corvette owner. I own an 88 corvette.
Anyway, my problem is if I make a hard right turn the AC turns to heat. If I make a rare hard left turn and am lucky the ac kicks back on. So, I know the AC works but I suspect its some switch that indicates whether AC or heat comes out. I know basic car repair and use my manuals I bought but not even sure exact problem.
What is name of item and will it mean removing alot of the dash to access and repair. thanks.
Anyway, my problem is if I make a hard right turn the AC turns to heat. If I make a rare hard left turn and am lucky the ac kicks back on. So, I know the AC works but I suspect its some switch that indicates whether AC or heat comes out. I know basic car repair and use my manuals I bought but not even sure exact problem.
What is name of item and will it mean removing alot of the dash to access and repair. thanks.
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Sorry, have never heard of this problem, so no specific area to point you to.
I'd start by determing if the compressor is turning off? If so, then checking the clutch activation wiring might be appropriate.
If the compressor continues to be engaged, then it might have something to do with the air handling door (which I think swings back and forth to allow air to pass over the heater core vs the ac condensor).
However, my thought is that it is wiring related and not a switch. Further, if we assume it is body stress/flex causing a wire (or two) to seperate/connect, then I would doubt there that much flex in/behind the dash.
So, I'd examine the wiring in/around the suspension and/or wiring which passes through the firewall. E.g. on our 1994, the wires to the AC pressure sensor in the AC line near the 'air box' at the firewall, is tight, and excessive body twist could make it too tight.
I'd start by determing if the compressor is turning off? If so, then checking the clutch activation wiring might be appropriate.
If the compressor continues to be engaged, then it might have something to do with the air handling door (which I think swings back and forth to allow air to pass over the heater core vs the ac condensor).
However, my thought is that it is wiring related and not a switch. Further, if we assume it is body stress/flex causing a wire (or two) to seperate/connect, then I would doubt there that much flex in/behind the dash.
So, I'd examine the wiring in/around the suspension and/or wiring which passes through the firewall. E.g. on our 1994, the wires to the AC pressure sensor in the AC line near the 'air box' at the firewall, is tight, and excessive body twist could make it too tight.
Melting Slicks
Joined: Apr 2003
Posts: 3,110
Likes: 6
From: Red Sox Nation! RI
I just went through my entire heating & AC system and this is just a guess, as The Admiral mentioned as well. There is an air mixture door that directs air to flow by either your heater core, for heat, or by your evaporator core for AC. If the linkage that controls that door (or the plastic clip) is broken, it will flop back and forth when you turn. If it moves towards the passenger side, you'll have AC, move towards the driver's side, you'll get heat.
Member Da Mail Man said he's found a replacement clip that will repair the problem.
Member Da Mail Man said he's found a replacement clip that will repair the problem.
