Interesting - thanks for that info. My Cherokee doesn't have AC, so I've apparently been out of the loop for the last 12 years as far as the apparently common AC-assisted front defrost. I did notice the extra load (headlights dim slightly, etc) when turning the front defrost on last night.andrewclaus wrote:Front defrost always turns on the A/C, which often requires a higher idle speed for the extra compressor load.