2007 Chevrolet Impala Q&A
2007 Chevrolet Impala Question: heater only blows hot air if the car is moving?
check coolant level might be low or maybe leaking. - 773mtech
Your need to add coolant to your resevoir - Visitor
I had the same issue, it is definitely coolant related, the level is probably low, so you more than likely have a leak somewhere. Don't just trust the overflow tank either, because you probably have an air pocket in your system, so check the radiator fluid level and you will need to vent the system when you are filling it to get all of the air out of the lines. - Visitor
My car was blowing cold air and then overheated. Took it in to my mechanic, replaced the thermostat and flushed the core out. Heat and car worked great for two months, then the same things happen...