After-run Sensor Test???

[Darek Jarski]

SJM site makes it sound like the afterrun system should kick on any time the
engine is turned off while at high enough temp to trigger the normal fan
speed. However, it sounds like the threshhold is a little higher. Am I
correct in assuming that since it turned on once the system is operating
correctly? Seems like a reasonable conclusion; however, I was under the
impression that the afterrun system is triggered more frequently ... am I
mistaken on this point?

Thanks for the help,
Darek
'89 200tq


>From: Tony Lum <tlum at Gigatronics.com>
>To: Darek Jarski <darek_jarski at hotmail.com>
>Subject: RE: After-run Sensor Test???
>Date: Wed, 21 May 2003 14:38:15 -0700
>
>
>
>-----Original Message-----
>From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
>Behalf Of Darek Jarski
>Sent: Wednesday, May 21, 2003 1:31 PM
>To: quattro at audifans.com
>Subject: After-run Sensor Test???
>
>
>Quick question:
>I was almost sure that my afterrun sensor was bad [since the system never
>turned on] so I have one the way from the dealer. Yesterday the pump and
>fan
>kicked on after a normal drive [for the first time as far as I know]. I
>haven't been able to get it to kick on again. As a test, I let the car warm
>up to the point when the first stage fan kicks on then I turn it off and
>wait ... nothing happens. [If I jumper the two wires the afterrun system
>kicks on.] Hence the question: is there a sure way to find out if the
>sensor
>is bad [i.e., via a ohm meter, etc.]? Second, is possible for it to work
>intermittingly?
>
>Thanks,
>Darek
>
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>You could remove it and suspend it in water with an ohmmeter attached to
>the
>terminals.  Now with a thermometer in the "bath" raise the temp of the bath
>till the ohmmeter (or maybe a continuity buzzer) indicates a short.  I
>think
>the temp is rather high, I've only heard mine go off once or twice.  Check
>www.thepartsconnection.com to see if there's a lower temp unit that will
>replace the OEM.  I did this to my fan injector cooler which now trips at
>85C vs. 90C and it runs the injector fan almost every time I shut the
>engine
>down.  Also make sure the after run pump is not seized.  If it is, you'll
>soon fry the 571A after run relay (burnt traces and blown transistor).
>
>HTH,
>
>Tony
>'83 urq #DA900302

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