Cadillac Repair/heat problem


I've change the upper line AC sensors , change the climate control, change the computer behind the glove box , change the thermastat and still blows cold air the car has been sitting for bout 4 years note I didn't flush the system antifreeze but saydrained half out n refilled with new stuff as I let ran to get air bubble out. So the dash says service AC  and the climate control switching from auto to econ every time please email n let me know what the problem is?its 1991 Cadillac sedan Seville 4.9


I am afraid you may have to flush the system. You did not say if the radiator hoses got warm, or if you found the inlet heater hose warm/hot. The cooling systems on these Cadillac aluminum engines have small water jackets and get restricted, and heater cores get plugged.
The firs thing you need to know is what is getting hot in the cooling system.

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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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