Heater only works when accelerating

Asked by GuruN27ZJ Nov 07, 2019 at 11:46 AM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

Just changed my water pump and now my heater
only works when accelerating.

2 Answers
18,665

munron answered 5 years ago

There's air trapped in the cooling system. Happens all the time. Use the valve near the thermostat to release the trapped air.

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