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  1. M

    Pressure in coolant system pushing into expansion tank

    Hey everyone I need some help. I’m afraid I know what’s wrong but keep denying it. I have a 2012 6.7 Cummins HO. Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. Causing coolant system to be starved of coolant. I have changed thermostat...
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