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90C does not trigger the aux fan yet. It will be around 105 or 110.
However, running A/C should trigger the aux fan.
<p>Basically you need the wiring diagram, a multimeter and jumping wire
to do the debug. ALLDATADIY.com is a good online source but it needs
annual subscription ($35? first car, $14 add'l). The graphic on MB
CD manual is not very clear. If you want (and don't mind the fuzziness),
contact me by email and I can fax the page to you.
<p>d drake wrote:
<br>> OK gurus, '91 350SDL ( no giggles! ) at idle, temp guage reading
<br>> 5mi trip level ground 55mph, a/c off, neither aux fan operating but
<br>> distinct "click" being heard, sounds similar to a spark you get when
<br>> a battery. Opened the hood, but could not pinpoint the noise. My
<br>> that there is some switch/relay that tells the aux fan to start running
<br>> this one is shorting out. Have any ideas????