Question about 1988 GMC C1500

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1988 gmc sierra temp gauge

Temp going to 260 then back to 225. Hear water in the heater core moving around. Turn truck off and water bubbles back in res. tank.Changed thermosat and all sensor.

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  • frank_lisa14 Mar 05, 2009

    Heater core new. Maybe Airlock thank you

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You could have an air lock in the system. Run with rad cap off and cycle the thermostat, adding coolant as required. Or a possible heater core.

Posted on Mar 05, 2009

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