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Re: Nasty coolant. Bad head gasket?
Go to a parts store with borrow a tool program borrow the leakdown rad tester
Hook it up run pressure to about 15 lbs or so
Check readings over 1/2 to help see how far it drops
Do you smell antifreeze in the cab ?
Leaky heater core will not contaminated the coolant with oil
You can bypass the heater core retry leak down pressure test
Check for wet spots around the intake
Run the truck cold with no cap watch coolant for bubbling this is an indicator of a possible failed head gasket
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