I have a 08 jk that is having ac/heater control issues. When I have the ac button on, only the fan blows. If I hit the recirculating button and turn off ac button, cold air will come out of the vents for a few seconds and then compressor kicks off. Mine has rear window defrost and all the heater control units that I have found that are $250+. So my question is, could I use the same heater control that doesn't have the rear window defrost? I live in Florida so it's not really needed. Thanks.