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gurgleing sound from heater core area on 1992 Chevrolet 1500 Pickup

sound occurs when rpm increases have replaced heater core,thermostat,radiator,radiator cap

Asked by for the 1992 Chevrolet 1500 Pickup
check the heater valve or the vacuum hose or air in the cooling system
1 more answer
check the heater valve or the vacuum hose or air in the cooling system