problem or not. But has anyone else noticed that with an 06 SS S/C Stage II, when you have the heater in the straight up/floor position, that the A/C compressor is running? One click to the left of straight on floor position and it does not. So if you have been running with the heater on in the full floor position and wonder why your mileage is down, now you know. I'm not talking about defrost or defog positions - as I said full on, straight up, floor position. Although a fair amount of air blows out of the defroster in this position, doesn't seem like it should activate the A/C compressor until you at least move one click to the right of the floor position, where it is entering into the defog position.

Doc