I have a 94 coupe.

The button on the dash that controls the temperature is acting up. When I push it on the left side to drop the temperature, the current temperature 'setting' flashes on the digital display and I can lower the temperature control by continuing to push that button. Makes sense. However, when I push the right side to raise the temperature, there is no response from the system on the digital display and therefore I can not raise the temperature.

Driving home this afternoon I kept playing with it and could never get the 'heat' or right side of the button to kick in, only the cold or left side seems to work. I turned the car off then turned it back on and the right side of the button worked. The digital display responded and I was able to raise the temperature.

After thinking about this I seem to remember this happening before but never put much thought into it. However, with winter coming and cooler temperatures I am more aware of this issue.

Any suggestions?

Is it difficult removing the instrumentation panel to get behind the button?

I do have a FSM and will check it out there also.

My first guess is that there is an electrical contact behind the button that is either dirty or worn out. That would require removing the instrumentation cluster on the dash.......any feedback on how difficult that is? My experience with other cars is that it can be done without much difficulty. I have no experience working on vettes though.

 

I had the same problem on my 94 vert. I took the center stack apart to remove the temp control unit. I disassembled the unit to the point where I could get at the contacts behind the rocker switch. I cleaned them with a Q-Tip and some rubbing alcohol. The job was not difficult and the temp goes up an down with no problem now.

 

Thanks for the quick response......somewhat what I was hoping for.....how difficult was it to remove the center stack?.....are there screws that hold the stack in or is it a matter of 'popping' it out.

Thanks again.

 

with other member, dirty 'carbon button/circuit board' issue...

There are lots of screws -- but it is still easy -- be sure to use the FSM, it will help id what to take apart (e.g. take off console lid first).

ALso, remember to be very careful with the console (around the shifter) as the rubber coating can be easily damaged, and very difficult to repair).

Lastly, one of the reasons dirty contacts (between rubber membrane and contacts on circuit board) cause functions to act oddly is that the control head is not sending electrical 'on/off' signals but sending a digital signals to downstream controllers --

 

Have not even looked at it, but thanks for the heads up on a lot of screws and having to remove the console lid first. I would have probably looked first around the temp panel....... I am sure that will be mentioned in the FSM.