Q: Air conditioner blows colder at idle and heater blows slightly warm.

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ac blows cool when driving but cold at idle and the heater blows slightly warm even after driving several miles. The engine coolant is full , one heater core hose is hot and the other is considerably warm, engine temp is normal . I have heard a loud pop inside the cab recently like the the blend door slaming shut a couple of times before this problem . Can u tell me how and what to check ? 2002 f150

My car has 100000 miles.
My car has an automatic transmission.

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