The climate control on my 1996 Cadillac sedan deville will not function properly. If I set it to 70 degrees, for example, it goes right back to 75. It stays in defrost mode and cycles between the a/c and heater. If I try to switch it from auto to econ it goes right back to auto. can anyone tell me how to fix this or at least maybe what is wrong?
Unfortunately, it sounds like your HVAC control module is failing. You can try a reset by removing the negative battery lead (under the rear seat) for about 10 minutes, and then reconnecting it, but if that doesn't work, you will probably have to replace the module.
SOURCE: I have a 1996 Cadillac Sedan DeVille. This spring...
If the a/c does not engage as a result of the electronic control system in your 1996 Cadillac, the climate control system may need to be replaced.
However, if the problem is being caused by low charge of R134a in the system, have the system charged before changing that electronic part.
I have never seen a Cadillac Climate Control System do this, which leads me to believe that it may be more electronic than refrigerant pressure related.
If the refrigerant pressure was low in the system, the climate control system should still stay on 'auto' mode, I think, and simply blow warm air.
SOURCE: my climate control button auto/econ keeps sticking
If when you push auto it goes to econ that normally means you are low on freon.
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