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Without knowing more about the car like how many miles,how old what kind etc etc i can tell you that if its not leaking coolant and there is not bubbles in your radiator then you either have a plugged waterjacket or bad waterpump. So hard to tell for sure without more info. You can have a blown headgasket,bad valves,or many other things but without knowing how many miles on the engine i do not want to guess. Bottom line is, look for the obvious first. BUbbles in coolant is a sign of internal problems. Have the radiator checked out. I think autozone will look at it for free.

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15y ago

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