Why does your 2001 Chrysler Sebring blow out hot air only while my car is revving?

The most likely cause of this issue is a problem with the heater control valve. This valve controls the flow of hot coolant to the heater core, which is what produces the heat in the cabin of the car. When the heater control valve is stuck open, it will allow hot coolant to flow to the heater core even when the car is not revving, causing hot air to blow out of the vents.

To confirm that this is the issue, you can try turning the temperature control knob to the coldest setting and see if the air coming out of the vents is still hot. If it is, then it is likely that the heater control valve is stuck open.

You can try to fix this issue by flushing the heater core and replacing the heater control valve. These repairs can be done by a qualified mechanic.