I have a 04' impala with dual climate controls that had transmission work done. When I got it back the a/c was blowing hot air. I've checked all fuses, relays. The compressor is kicking on and sounds like refrigerant is flowing. I've tried taking the A/C fuses out and starting the car to let the actuator "reset", and disconnecting the battery to reset too. How about a bad expansion valve?? Thanks.