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Bad Head Gasket/Cracked Head or Block?


GrandRegal

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I've replaced the t-stat on my car and make sure to bleed the cooling system but have still ended up feeling bubbles in the upper radiator hose. The car is a 1993 Regal 3800 with 110000 miles on it. The car does not overheat or loose much coolant but i am concerned it might have exhaust getting in the coolant. Any ideas on what it could be or what I should do would be great. I was thinking maybe a block sealer or something. Thanks Video link to bubbles in radiator:

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Well, "block sealer" would be an absolutely last resort. A bad radiator cap could cause your issues, if it's no longer holding pressure, the boiling point of the coolant would drop quite a bit, and could cause bubbles, particularly if you live at a high altitude...lower pressure equals a lower boiling point for the coolant.

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