michael mdearing at
Thu Aug 7 06:30:35 PDT 2008

Each of the MFTS I have received has signs of experiencing a coolant  
leak.  I took two apart and the electronics is fine.  The contacts on  
the connector had coolant corrosion but this cleaned up easily with  
Contac-Renu.  My guess is that the copper washer fails after some  
time and a very small leak occurs (2 reservoir inches per year).   
Does anyone have a source for compression copper washers like these?   
Must be a generic metric part.

(The electronics inside the MFTS contains an active analog chip.   
Simple resistance checks at the connector are not likely to be  
- Michael

On Jul 20, 2008, at 2:00 PM, 200q20v-request at wrote:

> Date: Sun, 20 Jul 2008 11:07:56 -0400
> From: "Ben Swann" <benswann at>
> Subject: MTFS - Multi Function Temp Sensor Testing
> To: <quattro at>,	<200q20v at>
> Cc: 'Ben Swann' <benswann at>
> Message-ID: <031001c8ea7a$64181a30$0201a8c0 at swansong>
> Content-Type: text/plain;	charset="iso-8859-1"
> I'm not finding information on how to test the Multi-Function Temp  
> Sendor in Bentley
> Manual for 5000 or 200 series.  Anyone have some information on  
> testing these out?
> Relevant cars include '86 on 5000 turbo, 200 and '91 200 turbo  
> quattro among others.
> Ben

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