1992 Chevrolet 1500 Pickup Q&A

1992 Chevrolet 1500 Pickup Question: gurgleing sound from heater core area

sound occurs when rpm increases have replaced heater core,thermostat,radiator,radiator cap -
Answer 1
check the heater valve or the vacuum hose or air in the cooling system -
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gurgling sound from heater core area when rpm increases have replaced radiator,thermostat,radiator cap,heater core, sound still there. have left radiator cap off while motor runs to operating temp ...