Q: Q: Blown head gasket

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My question is what causes water to bubble in my overflow tank?

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Q: Can a gasket leak from the intake leak air into the cooling system?

Hi there. An intake gasket leak would allow unmeasured air into the intake and create a lean condition, not an overheating issue. Base on what you've described, it sounds like you may have a leaking cylinder head gasket. Adding sealants...

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