2001 Mitsubishi Eclipse

Heater problem
2001 Mitsubishi Eclipse 6 cyl Front Wheel Drive Automatic 52000 miles

Hi there, I just purchased a 2001 Eclipse GT used with 52000 miles. Now that the mornings are cold, I start my vehicle to warm it up but, it isn't warm even starting it for 20 minutes before leaving. When I start to drive it seems to get warm when I push on the gas, but when I'm not pressing on the gas pedal, it goes back to cold air. I had it at the shop, and they couldn't figure out what is wrong with it? HELP!
October 1, 2009.

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