I've got a wire loose

[Huw Powell]

> That's pretty much my experience with my 87.5 CGT. Three wire fan, 2 speeds. Low speed most of the time, high speed when REALLY hot or when AC pressures build up high. No sign of an after-run feature so far, but I don't drive the car hard during the last few minutes of a trip so it may not be hot enough to kick in when I park it. Do you think I should have an after-run? Any thoughts on what to look at?

you do have the system, whether it works or not is another question.

find the bracket on the back of the head, mounted with two cam cover
bolts.

carefully pull off it two wires.  just after turning off the engine,
short them to each other.  if the fan runs, the relay and wiring are
good.

now, if you want to check the sensor, here is the silly, "do not do this
at home, kids" method.

connect the wires again.  carefully heat up the bracket with a propane
torch, being sure not to heat *anything else* up, like nearby hoses or
wires.  the fan will come on after a minute or two of this if the sender
is good as well as the rest of the system.

these normally aspirated cars seldom seem to generate the underhood
temps required to activate this system, unlike our fire breathing turbo
friends.

As a side note, I rigged my '82 coupe (no afterrun system) radiator fan
system to run on the battery instead of ignition, so the regular
one-speed fan runs after shut-down based on coolant temp, not underhood
temp.  It will often kick in just as I turn off the key, but only run
for 30-60 seconds.  But that engine usually gets right foot punishment
whenever I choose to drive it.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/