heater core

35

Asked by 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

10

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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