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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It would appear your thermostat is stuck in the closed position , find where it is on your engine, drain coolant and remove thermostat housing and stat, replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if all ok replace thermostat with a new one and new gasket, you could also flush the sytem out at the same time with a hose pipe by loosening one of coolent pipes and flush radiator.

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The heater core fills with bubbles, it's commonly the highest point in the cooling system. When the motor is turning slow the water pump isn't moving enough water to force the bubbles to go on through the heater core but when you speed the motor up the pump is able to force the bubbles down to the motor. They'll go to the top radiator tank and then out the pressure cap to the recovery tank. Look for bubbling in the coolant recovery tank.

lp

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