Question about 1997 Cadillac DeVille
When you say thermagasket kit,I assume you mean one of those silly DIY gasket sealant liquids that you put in the engine.
You should not use these type of products on ANY engine let alone the Northstar.
To cure a headgasket leak, replace the headgasket.....there is no miracle cure.
On the Northstar, you will damage the cooling system,plus you will continue to have issues as time goes on.
How do you know you have a blown head gasket?
Here is something to consider.......
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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