I have a 1992 gxe. The heater/ac stopped working recently. For a while it would work now and then, randomly. When it worked the AC heater worked fine. Now it will come on for a second every now and then if I mess with it. First I removed and serviced the blower motor, as this used to be a common problem with my 90 stanza gxe. I then realized the the lights on the control unit do not come on at all anymore. Would this sugest the problem is with the heater/ac control unit? Is there a way to test it? What else can I do to narrow the problem down?

Cheers,
Matthew

 

From the looks of things, it could be the control is jacked up. You might do better by replacing it. Also, make sure the fuses and everything else is in working order.

 

Yes I did check the fuses. I had all of the dash apart looking for something, but stopped short of pulling the control unit out. Could it be a relay? Or would the lights on the control unit still be lit if it was a relay? Is there a way to test the control unit if I remove it? How much is a new heater/ac control unit, I guess I can check online but just curious if someone has done this recently.

Cheers,
Matthew

 

I after doing all I could do with my limited resources and knowledge I took the car to the dealer. They had the car for a couple of days and finally determined it was a bad ground in the wiring harness for the heater control unit. They wired a new ground into the harness and everything is working again. They were nice and only charged me 3 hours. Hope this may help someone someday.

 

If you had searched, you would have found a very similar post a couple days ago, in which I replied that it was a problem with the wiring... It could have saved you a ton of cash and only taken about 30 minutes.