01 Cadillac Deville over heat

RIYAD614

MEMBER
2001 CADILLAC DEVILLE
V8
AWD
AUTOMATIC
125,000 MILES

I have a 2001 cadillac deville 125,000 mile. It over heats, I changed the water pump, thermostat, cap and radiator. The car has no water in the oil nor it is coming out of the mufflers. It will build high pressure so bad it made a hole in the upper rediator hose. The funny thing is the lower hose will not get hot until I turn the car off when it is hot. If I drive it with the cap half open it will not over heat, but when it is closed it will build pressure. I pressure tested the engine and were no leaks. I don't loss any antifreeze, and the radiator stays cold, I drained the air from the engine from the upper small hose that does to the resevor with no luck do I just need anothe engine? Please help.

3 Replies

CADIEMAN

MECHANIC
3,544 POSTS

Does the throstate open and u see cirulation in the radior? Ck. Fan oper. Also gl

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Monday, March 28th, 2011 AT 3:36 PM

FACTORYJACK

MECHANIC
4,159 POSTS

It sounds like the thermostat may be faulty, especially if the lower hose fails to get warm. What was the symptom before all the parts were replaced? Is it different now then prior to repairs? I would advise if you are having overheat problems, to have the cooling system tested for the presence of combustion gases. It could have an internal leak that was part of an original overheat, or created by being overheated.