So on occasion, and I can't figure out a pattern to it, one, two, or several...but never all...of my climate control buttons just don't want to work. For example, if the A/C is off maybe the AUTO button will come on, but the recirculate one will not, or the temperature "up" button will work, but the "down" button won't. There doesn't seem to be any rhyme or reason to when it does this or how long it stays like that. At times, all buttons work. Next thing you know, hardly any do...and then the next minute, they're back.

Any suggestions on this matter before I go let my Chevy dealer bend me over the hood? :nono: :sad:

 

mine went just like yours. You can replace that unit for $125.00 and 30 minutes.

 

I would recommend cleaning the terminals in the back of the unit before replacing it. It's something to try and it's free. I have the same problem with my 96 and I am going to try to clean the terminals first I saw in another tread that it worked for a few others. :thumbs:

 

https://www.corvetteforum.com/techti...D=92&TopicID=2
Try the attached tech tip. It worked on my 94, 10 months later, still working :cheers:

 

Mine does the exact same thing. Sounds like I need to do some cleaning and see if that helps. Thanks for the tip. :cheers:

 

that problem and all the air blowing up out of the deforst ducts.
they all do it, and there are some articles on the other corvette site.
I forgot where I saw it.....

 

Is there a "How-to" on how to get to the back of the climate control unit? Thanks in advance...

:flag

 

There's the electronic control head (which sends signals) and a second, seperate module with solenoid valves, which reroutes the vacuum to do the switching of the airflow. Both of these units suffer from dirty contacts, and cracked and/or poorly soldered joints. Lastly there is a vacuum check valve (underneath the pass side fuel injector cover) that disintegrates due to heat, and since engine vacuum actuates everything, once this goes bad, the system won't swich the airflow to the various vents, even if the controllers are working.

I would do the following in this order:

1) ensure that the vacuum check valve is intact. Sometimes it looks OK from the top, but the bottom half is crumbling.

2) Remove the electronic control head, dissasemble it and clean the contacts with an eraser. Remove the rubber membrane and clean the contact buttons with alcohol. Wipe down everything that you've touched with alcohol. I prefer pure alcohol (rubbing alcohol has oil in it, so I choose not to use it for cleaning).

3) Put everything back together and see how it works. BTW, steps 1&2 solved all my problems, which were pretty identical to what you've described.

4) If you still have problems, then you'll have to remove the last module (somewhere underneath the dash, I think on the drivers side) and see if there are cracked solder connections or leaking vacuum hoses. You can reflow the electrical connections with a soldering iron. As with the BOSE amps, there are capacitors and resistors on the PC board that deteriorate and/or fail. They can easily be replaced if you've got half-decent soldering skills.

Good luck.




[Modified by sraft, 5:53 PM 12/21/2003]