Question about 1998 Cadillac DeVille
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Posted on Jan 02, 2017
Remove the cap from the coolant bottle and fill it all the way to the top. Then start the engine. Does the coolant shoot from the bottle?
Posted on Jun 26, 2009
did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking
Posted on Feb 26, 2009
check for air in system(cooling system) also check to see if cooling fans on radiator come on when car reaches about 225-230degrees, if not check relays and fans to see if they ar good if so see if both of them work (they should) if they both come on see if they go off if they dont ever go off then the engine is not cooling down have a tech. check it out ,could be a blown head gasket or worse
Posted on Jun 28, 2009
I am assuming you have the Northstar engine.
Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.
Are you running it without a thermostat? If so,then strangely enough,this will cause overheating as the Northstar cooling system is different to most conventional systems and therefore will not help you diagnose the problem.
Posted on Aug 22, 2009
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