Originally Posted by Jafro
Maybe his coolant system isn't holding 15 PSI of pressure. Maybe he has a bad head gasket and is blowing exhaust pressure into his coolant system. Maybe a radiator pressure test would fix his problem?
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That's what happened to me. Pressure building up in the cooling system. Bubbling coolant, and top radiator hose puffy. Car would drive fine for about a half hour, then gauge shot STRAIGHT UP. Not good times.
The dreaded head gasket.
Drive safe, dog!