OK gurus, '91 350SDL ( no giggles! ) at idle, temp guage reading ~90c after
5mi trip level ground 55mph, a/c off, neither aux fan operating but a very distinct "click" being heard, sounds similar to a spark you get when jumping a battery. Opened the hood, but could not pinpoint the noise. My theory is that there is some switch/relay that tells the aux fan to start running but this one is shorting out. Have any ideas????Dave