1986 electronic climate control issue
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Pro
Joined: Aug 2010
Posts: 525
Likes: 1
1986 electronic climate control issue
Not sure if this is an issue across the board but I know for sure other GM cars have the same issue with the electronic climate control. Anyhow mine only blows out of the top vent no matter what I set it to. Any ideas?
Heel & Toe
Joined: Oct 2011
Posts: 17
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From: Fort Worth Texas
I had this exact same problem with my 86 and fixed it just recently, I took out the programmer from under the drivers side and looked at the circuit board, the two large resistors had burned the board and were now loose, after replacing these resistors (bought some from RadioShack with a higher watt handling to keep them from getting this hit again) it worked just fine. This article should help too if yours isn't as rough as mine and you can just re-solder them. http://www.batee.com/corvette/acrepair/c68pgmrboard/
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Check the vac hose from pass side rear of the intake through one way valve shown below ( often broken / missing ) by the dist.
Also common for the plastic hard line from the rear port on the valve to the interior to be broken off ( not even found )
where it enters the wiring harness on the firewall
Pro
Joined: Aug 2010
Posts: 617
Likes: 17
From: Hamilton Ontario
So where does this vac line route to and hook up when it goes through the firewall?...i would like to trace mine as im having the same issues...air blows out all holes on any setting
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
and comes out of the under dash harness inside.
That would imply a different problem because you would have to have vac on all the vent door actuators at the same time for that to happen.
A vent controller problem maybe ?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
If you have a C68 system it goes to the HVAC programmer located above the gas pedal.
The default mode for the HVAC is HEAT (by federal law). Air is directed to the defroster in the heat mode, so many people think the air is going there when their HVAC has a problem.
Last edited by Cliff Harris; Aug 11, 2013 at 02:41 AM.
