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RE: turbo coolant pump ('91 200Q)

>Radiator fan...right...

>I guess since I've never the after-run fan either, I've got
>another problem. Fan relay?

>Rob Winchell 91 200Q

What you want to do is to disconnect the leads from the multi-function switch
(is it the multi-function switch or just a thermo switch? Dave Head has me
thinking....) Anyway, it's one of the two that are on the bottom side of the
intake manifold on the driver's side of the engine. 

After you disconnect the wires (I think they have spade clips on them), jump
them together, as if the switch was closed, and your coolant pump and I think
fan will come on. If it does, but you can't tell if the coolant pump has come
on, just jump 12 VDC to the pump and make sure it runs.

Then you can do one of two things.

1. Take out the switch (I think I used large vice grips) and see if you can get
it to switch open and closed, but you'll have to get it hotter than 110 degrees
C, so water on a stove won't do it. Also, your coolant will be draining out
while you're testing it.

2. If everything checks out above, buy a new switch from Clair or Carlsen for
about $28 (or $32?) and replace it. That's what I did with mine. After I
replaced it, it never worked until we got really hot days. Remeber, it doesn't
turn on until 110 degrees C.

I have heard the MC engine coolant pump/fans run all the time, but mine doesn't
except for the summer days.


Paul Waterloo
Riverside, IL

91 200q

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