Wayne, you're obviously not even reading my statements, because nothing you are saying negates what I said.

One more time: on most vehicles the manufacturers design the defrost system so that the AC compressor DOES NOT come on when the ambient temps are well below freezing. Above freezing, the AC compressor DOES typically come on to remove moisture from the air (though as you have stated on some vehicles this is optional with a separate AC button).

Which brings me to my main point (again): Since the original post was talking about ambient temps of 5 degrees F, the discussion of the AC compressor and defrost function is MOOT.

Since you're a Texas boy, we'll forgive your ignorance of bitter cold temps... <img src="/forums/images/graemlins/pfft.gif" alt="" />