I have a 2005 Chrysler Sebring, and when the car is idling there is cold air on 2005 Chrysler Sebring

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coming out of the air and defrost vents, but when i accelatarate it is hot air coming out. What is causing this problem? Could it be low on ANTIfreeze? Or could the thermostat be going out? The air conditioning works great, don't understand why this is happening.
(2) Answers
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I hope it ain't the thermostat on THAT engine! Make sure it is full of coolant.
It sounds a little like the water pump inpeller may be worn thus pumps more
coolant at higher rpm. Good luck.