Cadillac Repair/a/c


thanks for your answer, do you remember if the main control on the dash shut the compressor off when you rotate the temp dial or slide the arm for eco, high, bi level or is there a relay,
I traced the wire from compressor and I believed they go direct to the main control on dash, I just fixed the heat problem the vacuum sensor under dash in black box I think it called main heater control was not pulling in vacuum module thanks


I really do not remember that. Wow, 39 years ago, and I remember these things when they were new. One other thing I do remember from 1974. We were instructed to remove the starter interlock on them as all GMs from the factory had the interlock with 25 pounds of weight being required on the seat to prevent the engine from starting when the seat belt wasn't buckled. Last year without catalytic converter that ran on regular. Last year for points and HEI was introduced in 1975. Boy is that a lot of stupid crap I remember from 1974.

If you do not have one, try to get a factory service manual from Ebay or craigs. That way you are not working in the blind.

Good luck!

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Rob Painter


Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?


Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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