05 Grand Prix, With the car running for quite a while, driving and such, still no heat. Original owner, roughly 90,000 miles. I live in KY, it gets cold, but not that cold. just changed the thermostat, not the problem, has plenty of anti-freeze, nothing leaking in floorboard as if it was the heater core. I am pretty mechanically inclined and don't want to take it somewhere if I don't have to. I am confused...please help, what do you think? Thank you in advance.
2005 Pontiac Grand Prix....No heat, can you tell me why?
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