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Cadillac Repair/thermastat housing


Were is it located on a 85 cadallac eldorado 4.1


Just follow the upper radiator hose from the radiator to the top of the engine and that is where the housing is. If you have a overheating issue however, you have a 99.9% chance that the thermostat is not the problem.
The Cadillac aluminum engines are great for economy and performance, but they can not be overheated even a little bit. If the temp is above 220, components are melting. These engines have very small cooling jackets and something as small as a piece of silicone from old gasket material can plug the cooling systems. The head gaskets are the first to blow when the engine is over heated, but this is the effect and never the cause. Cooling fans that do not function in city driving will cause overheating.
If you are having an overheating issue, I can give you a number of ideas as to where to look.

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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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