97 Deville cooling system - Cadillac Forum - Enthusiast forums for Cadillac Owners

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Old 12-06-2008, 04:00 PM
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Default 97 Deville cooling system

1997 Cadillac Deville is over heating.. 260 degree's.. we areloosing fluid.. Itdoes not appear to be a head gasketbecause there are no signs of anti freeze in the oil.. no antifreeze leaking on the ground other than coming out over flow hose while refilling the tank.. and doesn't seem to be coming out of the exhaust.. The car has a new radiator.. new water pump.. new thermoastat.. Is there a way to burp the system or bleed it.. is there a bleeder valve some where.. We are going to try again in the morning with more anti freeze and a new cap.. So if you could help it sure would be appreciated.. thank you
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Old 12-06-2008, 07:00 PM
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Default RE: 97 Deville cooling system

Unfortunately northstars very rarely put coolant in the oil and don't always smoke when head gasket goes either.It sounds like head gasket(s), you could hope for a restricted radiator. If both radiator hoses heat up at about the same rate; it not the radiator. There is no bleeder also.
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Old 12-06-2008, 10:56 PM
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Default RE: 97 Deville cooling system

Check the coolant by pass hose from the holding tank to the block. It can plug up over the years and it wont burp properly. Remove the hose, engine off, and make sure the nipple at either end is not plugged up with debris. Very common issue with the northstar. When I fill a cross flow radiator, I have a friend hold the engine rpm above 12 to 1300 RPM while I add the fluid. Once full wait till the thermostat opens and the coolant will drop quickly. Keeping the fast idle, top off the radiator and quickly install the cap.
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