* MBDoc, thanks a million for your help. Since I'm likely to run into this problem again, can you refer me to a reference table of P1 and P2 values for various years and models? Or is it assumed that the tech is going to take these values from the old control unit before he/she replaces it?
* Are these values even stored in the climate control unit, or are they stored somewhere else (in the car)? In WIS? At StarTek?
* If the P1 and P2 values can be read on the face of the control unit, are the values displayed the same way that the real-time ACC metrics are displayed? Thanks again. (hopefully, I'll be able to afford SDS this year and this kind of thing won't be such a hassle).