heater core
45

Asked by bigchaz48 Mar 23, 2015 at 11:19 AM about the Pontiac GTO

Question type: Maintenance & Repair

replaced heater core in 71 gto,when started i hear a rattling noise coming from it,any
reason why?

1 Answer
40

brucediehl answered 9 years ago

Most likely you have an air pocket in there. Try to run the car with the heater on and radiator cap off untill both heater hose's are hot make sure the engine is cold before removing the cap

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