Subject: RE: afterrun thermoswitch BTDT

[C1J1Miller <C1J1Miller@aol.com>]

You wrote:  (major snip about getting '91 200q hot, letting idle until fan
comes on several times, etc. edited for brevity)
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<<Hood is still up, of course, so I do the short-connectors-together test to
verify pump can run. It does, I put them back on, ponder a bit, then go fire
off note to q-list.

Perhaps the system is still functioning as intended, and I just haven't got
the 
car hot enough and watched it afterwards. The cooling system does seem to have
significant ability, so the funny thing is that running the car hard and then 
shutting it down to check afterrun workings seems to border on vehicular abuse
(if the afterrun doesn't in fact work after all).

No luck on any such test today though, it's now under 50F and raining to beat 
the band. Good quattro weather, anyway.

Hmmm,
Henry Harper>>
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Henry (and others):
I've posted this before.  On my '91 200q, the fan and pump acted much the same
as yours when I first bought it.  Brought it back to the mechanic, he checked
out the relay and thermoswitch and now, the fan and pump come on pretty much
every time I drive the car more than a mile or so.  About 10 seconds after
shut down, low speed fan and pump comes on.  Runs a couple minutes, shuts down
a bit, starts up again a while later.  If you've ever put your hand in near
the oil dipstick area, you know that the cars get _very_ hot.  I think mine is
working correctly; I'd rather run the fan and pump too often than not enough;
worst thing I'll do is wear my battery out prematurely; hopefully it is
keeping the heat soak to a minimum.  As I recall, when the engine shuts down,
the coolant (and oil) actually get hotter for a time in/near the head; the
pump and fan help combat this.  So, if the engine was cycling the cooling fan
when it was running, it should do so just after shut down.  That was also
normal for the '86 4000csq I had before my 200q.
HTH, Chris Miller, Windham NH, c1j1miller@aol.com
'91 200q