Re: afterrun thermoswitch BTDT

["Mike Miller" <JoMi@email.msn.com>]

As I recall, the afterrun only comes on at a temp over 210 F.  Mine does not
come on for at least 4 or 5 minutes after I turn the car off - and then not
very often..

mike miller
91 200q

-----Original Message-----
From: Phil and Judy Rose <pjrose@servtech.com>
To: hah@srv.net <hah@srv.net>
Cc: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Date: Friday, April 24, 1998 2:44 PM
Subject: RE: afterrun thermoswitch BTDT


>Henry,
>
>Just a thought: If the "test" was with the hood _up_, that may have gotten
>the system cooling off too quickly for the after-run to get switched on. I
>think the after-run may be designed to work only in pretty extreme
>heat-load situations. If so, and if the difference between 60F and 70F
>(outside temp) is significant, then having the hood open is probably gonna
>be significant as well. (damn I don't wanna have to replace my switch!!!)
:(
>
>Phil
>
>>Phil R. sed:
>>> When I replaced the multifunction switch on my '89 100, I was able to
get
>>> the new one in before more than 1/4 liter (or so) of coolant had
escaped.
>>> However access to the after-run switch on the '91 200q is _so_ limited
that
>>> I'd expect to lose a _lot_ of coolant.
>>>
>>> Let us know if you manage the job without serioiusly skinning at least 3
or
>>> 4 knuckles. I got some painful abrasions just getting the connections
off
>>> to do the test. :(
>>>
>>
>>Contortions definitely required. I let it cool off *almost* enough to not
>>burn
>>myself on the various warm things around there, and the
>>oil-level-checking-device tube is very much in the way.
>>
>>> BTW, on my "new" '91 200q, the after-run came on for the first time
about
>>> 10 days ago when there was a spate of unseasonably warm weather (close
to
>>> 70 F, wow!). I idled the engine in the driveway until the cooling fan
came
>>> on and then shut the engine down immediately (temp gauge at 12 o'clock.)
>>> Then I checked the mail, went inside the garage, started around into the
>>> house, and after what _must_ have been at least 4 or 5 minutes, the
>>> after-run came on. This was a very similar experience to what I
encountered
>>> with my previous car--although it was during the Fall season then.
>>>
>>> So, although it may still indicate a faulty component, it's possible
that
>>> the after-run sensor might not trigger without warm outside temps plus
>>> having several minutes to activate--when we're likely to be long gone.
>>>
>>
>>That's more like a BTDT that I asked the list for earlier, but was
probably
>>buried in an unrelated note.
>>
>>Here's what I did yesterday coming home from work. Well, I drove home,
>>about 15
>>minutes, temp gauge is at first bold hash as usual. Ambient about 70F, but
>>becoming partly cloudy and cooler. Let it sit idling in the driveway,
>>(hood up)
>>trying to get fan to come on. With AC, stage one fan is always on, at idle
>>for
>>this temperature not enough heat generated to get stage two. Turn AC off,
get
>>stage two (from stage zero) every five minutes for about a minute. Get
bored,
>>leaving hood up, turn off engine and begin to play with my favorite
driver's
>>door innards while things cool off so I can pull off the afterrun switch
>>connectors to test the pump. I mess with the door for 20 minutes or so
before
>>connecting a particular way to reassemble the inner handle with that silly
>>clicking noise when lock/unlocking, don't ever hear the fan/pump come on.
>>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
>>http://www.srv.net/~hah
>>1991 200 quattro, 87k, does or does not the afterrun subsystem work
properly,
>>that is a question for another day
>>1988 GTI 16v, 177k, only rarely do I hear the afterrun fan come on in this
>>car
>>(and pretty much never hear the turbo pump :)
>
>
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