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Mend Coolant Pressure Engine

Coolant system under pressure?

When I take the header tank cap off, the system seems to be under pressure, even after standing all night, and when I run the engine with the header tank cap off, the water in the tank froths up. What is causing this?

BXTZD
March 2009

Vehicles, Cars Coolant Pressure Engine

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Car Coolant Pressure & Frothing - Causes