[200q20v] Busted temp sender, or gauge?

[C1J1Miller at aol.com]

 In a message dated Tue, 15 Aug 2000 10:06:19 AM Eastern Daylight Time, "Rob
 Winchell" <rbw at swiftcorp.com> writes:

 << My coolant temp gauge has been all crazy for the last month or two.
 Sometimes it works fine, sometimes it's just dead (pegged at bottom). I sort
 of assumed this was the multi-function temp sender going bad. However, the
 fan still comes on at appropriate times. What tells the fan the engine is
 hot and needs to go on, if not the temp sender?

 Thanks,
 Rob Winchell
 91 200Q
  >>

 There is a thermoswitch in the radiator that controls the fan speed.  See:
 http://www.sjmautotechnik.com/cooling.html#fan
 The thermostat controls the temp in the head/engine while heating up, and if
 the radiator system works correctly, thereafter.
 chris