what runs the defroster on a engine
RE: AC compressor cycling. IP: Logged. Message: I have an '03 QC 4.7 v8 and the a/c unit will cycle when it's set to defrost and high heat on the temp gauge, a/c off. I read a post last night that talked about pulling the a/c defrost fuse # 24 (on the my truck) during the winter months to keep the a/c from cycling.