My sons 96 Century 3.1 looks like it may have a blown head gasket. That’s what 2 mechanics have advised as it did overheat and although it shown no performance issues, I do see some bubbling in the overflow tank and the temperature gauge goes up and down while driving. I’m having a hard time believing it’s a head gasket as there is no water in the oil and nothing coming out of the exhaust. Any way, I hear that an application of “waterglass” or K&B block seal will prolong its life. Anyone use these products with any success?
the fact that there is no water in the oil or ugly smoke coming out of the tail pipr doesn't mean the gasket isn't blown. All the usual headgasket symptoms are dependant on where the gasket has blown out.
If you're getting bubbles in the coolant bottle it probably means the gasket is blown between a coolant passage and a combustion chamber, thus allowing the combustion gasses to escape into the cooling system.
What I would suggest is that you remove the radiator cap before starting the vehicle and letting it run for a little while. If a brown froth forms on top of the coolant, then you're looking at a headgasket job.
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