hey guys, i replaced the fan clutch on my 05' 2500hd earlier this summer. the problem is on startup its engaged for like a minute or so till a drive about a half mile then it goes back. the one i bought was a cheap $50 from auto zone rather than paying $250 from the dealer for an oem one. is there a cheap fan clutch that only engages when it needs to for less than a hundred bucks. when its below zero here soon the fan blowing full force on every startup will not be good. thanks ---------- Post added at 02:39 PM ---------- Previous post was at 02:32 PM ---------- also everytime the a/c is turned on the fan speeds up,(highway or street) how is this even possible. i plan to go electric fans someday better mileage and power ive heard.