I tried a Google with not much luck, jut looking to see if anyone has gone through this before. The HVAC system in my 1977 MM LIfelienr is dead. I checked the blower: works, the fuse: good, pneumatic vent controls work and switch he air flow correctly yet no power to the fan motor fromt he stock brown Cadliiac 12 g wire.
The MM Switch Rear AC/HEAT in the over head panel has power, but I don’t think that should affect the factory HVAC function. (I will tackle the rear stuff next)
I do have the 1977 Cadillac manual, but not with me at the time of this post. My next step is going to be pulling the dash and checking the connections behind the control module.
Just though I would put it out there in case someone has found an easy fix for this symptom….
The MM Switch Rear AC/HEAT in the over head panel has power, but I don’t think that should affect the factory HVAC function. (I will tackle the rear stuff next)
I do have the 1977 Cadillac manual, but not with me at the time of this post. My next step is going to be pulling the dash and checking the connections behind the control module.
Just though I would put it out there in case someone has found an easy fix for this symptom….