Make your fan a manual fan - I just installed a switch in mine, it looks good on the panel and keeps everything real cool up front. Combined with a new fan clutch, I can't even try to overheat. Email if you want details on my installation of a manual fan switch. James Have a 86 635csi, the aux fan works if hot wired, replaced both high & low temp switch today and still does not work (both fuses checked out o.k.)even though the temp gague shows the needle in the middle. Wondering if anybody out there has any suggestions to the problem. Thanks .