Having a "thermister" (I think it's spelled "thermistor") in series with the
fan actually makes some sense. A thermistor is an electronic device that
acts as a resistor with a non-linear negative temperature coefficient. I
assume it is in series with the fan, and thermally bonded to the radiator or
the engine block so that it can sense engine temperature. Then, as the
engine gradually cools after being shut off, the resistance goes up, current
goes down, and the motor gradually slows down. Just the way it oughta be.
Sumner Weisman
62 TR3B
Date: Thu, 05 Apr 2001 22:44:26 -0400
From: Jeff Johnson <mondolux@speakeasy.net>
Subject: RE: switched Fan -- more than you wanted to know?
Silly is exactly right.
Chrysler had a heat soak problem in most of their mid '80's cars and
thought that the best way to solve the probem was to allow the fan to run
for 10-15 minutes after ignition shut-off. Only contributed to the problem.
Their cure was a 'thermister' (Chrysler's term) in
line with the fan. When the inevitable problems surfaced with this
arrangement, the mechanic's best route was to cut out the thermostaic
control and wire the fan directly to the ignition.
BTDT.
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