1994 Cadillac Deville

JBELL6156

MEMBER
1994 CADILLAC DEVILLE
V8
FWD
AUTOMATIC
145,000 MILES

My granddaughter has a 94 Cadillac Deville that runs hot frequently and the engine shuts down. To move the car is done by towing. She has replaced the radiator, water pump, thermostat. Could someone advise as to why this is happening? Have checked the oil and it is not milky. The car sat for a while and gray smoke came from the exhaust but it did later clear up. What is causing this problem? The car engine is not Northstar.

Wednesday, December 2nd, 2009 AT 8:30 PM

1 Reply

FACTORYJACK

MECHANIC
4,159 POSTS

If this happened after the cooling system was serviced, it could have an air pocket in the cooling system. Due to design, the thermostat sits high in the system, and air gets trapped around it. It may not be opening, because of this. It can either be pushed open with the upper hose off, and filled through there, or even the heater hose that comes off the housing and makes a left at the rear of the engine. With some liquid around the thermostat, it will transfer heat to open it. Head gasket leaks are not as common on a 4.9l, but it is possible. If you are certain there is no air in the system, have it pressure tested and block tested.

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Wednesday, December 2nd, 2009 AT 10:08 PM