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02 Duramax, Cooling system over pressurized, Stays over pressurized for days until the cap is removed. Is there
anything other than a head gasket that would cause that. The system over pressurizes in minutes, and will
start pushing fluid out the over flow.
waterpump and thermostats were replaced about two weeks before this issue. The truck has never over heated.

Thanks for any advice.
 

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Might try and clean or replace the cap and see if that helps if not more than likely you have head gasket problems.
 
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