'95 AC/Heater control switch problems
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 44
Likes: 0
From: Walnut Creek CA
'95 AC/Heater control switch problems
I've looked in the archives, and I've searched the threads here, and I see people have had problems with the valves and doors as far as heater control problems go. My problem is getting the little buttons on the dash to function. Sometimes they do, sometimes they don't. I thought I'd remembered seeing a thread about this years ago, but now I can't find anything on it. Do I just need to rip the control unit out and try and clean all the contacts, or is there some replacement of a board needed? HOw difficult is it to remove the conrol switch unit?
Thanks,
David
Thanks,
David
5th Gear
Joined: Oct 2005
Posts: 5
Likes: 0
From: Sammamish WA
I took mine apart and cleaned it, and it has been working fine since.
However, I have heard that all you need to do is disconnect the battery or pull the fuse for a few minutes, and the control will reset. So I do not know if mine is working because I cleaned it or because I disconnected the battery.
However, I have heard that all you need to do is disconnect the battery or pull the fuse for a few minutes, and the control will reset. So I do not know if mine is working because I cleaned it or because I disconnected the battery.
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 44
Likes: 0
From: Walnut Creek CA
Thanks GFR. I'm guessing as you replied to this post, that you were having the same problems: pushing the buttons sometimes elicites no responces, like the light for that button going on and actuating heat/ac/vents, etc.?
I'll try the fuse pulling idea first, then a battery disconnect, and lastly cleaning. IS that a pretty straight forward thing, pulling the unit out to clean it? How much of the dash will I need to remove?
Thanks again,
David
I'll try the fuse pulling idea first, then a battery disconnect, and lastly cleaning. IS that a pretty straight forward thing, pulling the unit out to clean it? How much of the dash will I need to remove?
Thanks again,
David
Instructor
Joined: Apr 2002
Posts: 132
Likes: 0
From: Dewey Az
If that doesn't work, sometimes it's lack of vacuum. Underneath the passenger side fuel rail cover is a 2 way vacuum valve with one line going to the cruise control and one going to the heater controls. On my '95, that valve has broken once (thru my clumsiness), and clogged up a second time. Both times , my heater controls refused to work and were stuck in defroster mode. Just something else to look for 
Good luck !
Good luck !
5th Gear
Joined: Oct 2005
Posts: 5
Likes: 0
From: Sammamish WA
Yes, I believe that your problems sound the same as the ones I experienced.
Check out this web site, it explains how to take the dash apart, and the last section talks about HVAC cleaning.
http://corvettefever.com/howto/153_0...cutoff_switch/
Check out this web site, it explains how to take the dash apart, and the last section talks about HVAC cleaning.
http://corvettefever.com/howto/153_0...cutoff_switch/
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 44
Likes: 0
From: Walnut Creek CA
Thanks GFR, An interesting article in the link you provided. Their installation of the airbag cuttoff switch resulted in the failure of the optispark unit??? I won't bother there, having had to replace the opti spark once already. Appreciate the link though. Interesting that they recommend cleaning the contacts with an eraser.
David
David
Burning Brakes
Joined: Nov 2005
Posts: 1,211
Likes: 2
From: Dumas Arkansas
I bet that's how my heater/AC doesn't really work. My ciggeratte lighter quit working so I had to replace a fuse in the aux. fuse box and I bet I hit that vacumm line to the heater. If I can figure what and where the line is another thing.
