In my '83 CD, the rear defroster does not turn on. I already replaced the relay with a used (but untested) one, but that didn't seem to fix the problem. The relay I replaced it with could be bad as well, but I hope not since they are expensive new and hard to find.
I don't think it is the switch only because the light comes on when the switch is pushed on, but I can't say for sure. (In the meantime, I've ordered another switch.)
Does anyone know how the rear defroster is setup in this car? I know the blower vents are back there behind the dash, but I don't know if they have a separate blower motor, if they are tied into the main system, or what. Id' like to test the blower motor to see if it is getting power, but I don't know where to find it.
Any information would be a huge help.