Q: Cooling system won't pressurize on a 1985 Military Chevy Blazer

asked by on May 03, 2016

I have a 1985 Military Chevy Blazer with a 6.2 diesel engine. Cooling system won't pressurize. I pressure checked the system and it held pressure for half an hour but won't hold pressure when I'm driving. Radiator cap has been replaced. Any ideas?

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