Originally Posted by 720Deere
It sounds like you are trying to use the climate control rather than simply turning the heat on. If you select automatic temp control the a/c must be enabled just in case it needs to be used to cool down to your selected temp. If you just push the the floor control button and run the temp up or down to your liking, the a/c should not light up. Sorry if I'm not understanding you, but it sounds like you may be using the automatic temp control.
Deere....I was wondering the same thing. During the winter I usually run my Auto Climate..unless the windows are fog, the I switch to defrost. But usually I leave the auto on all the time, and I just turn off the A/C. Now if I turn on the auto climate, leave the A/C lit up, and the truck wants to warm the cab, is it still effecient to leave the A/C on? I always thought with the A/C compressor running, the cab won't run as warm, I could be wrong. What do you think...or maybe one of the techs could chime in?