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AnswerDid you bleed all the air out of the system after doing repair work? Trapped air will cause it to overheat. A compression test will verify if the head gasket is blown or not. Is the cooling fan working?

A compression check will not always verify a leaky head gasket on a Northstar engine. Most of the time these head gaskets fail due to faulty head bolts. The threading on the bolts slowly pulls out of the engine block, creating a gap between the head and the block, allowing combustion fumes, oil, and coolant to mix together. One thing you can do is check your oil. A leaky head gasket will make your oil look like foamy chocolate. Also, you can take the cap of your coolant reservoir, start your car, and look for bubbling or "false boiling". Excess pressure in the cooling system caused by combustion fumes leaking into it causes this, which would also signify a leaking head gasket.

2010-01-14 01:30:27
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Q: 1994 Cadillac Seville sls northstar v8 it overheats new radiator new theromstat water seems to be flowing no steam from exhaust what is wrong w this thing is there a way to check for a cracked head?
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