I don't see how a similar modification can be done for my car.

Perhaps I could re-purpose the antenna switch to provide manual control of the 
aux fan...
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On September 7, 2015 12:00:13 PM EDT, Max Dillon <dillonm...@gmail.com> wrote:
>Intriguing! I hadn't considered such a modification for my '87 wagon, I
>was focusing on finding a temperature switch with lower set-points. I
>did find one that is  lower, I think it drops the aux fan engagement
>temperature to 110 Celsius, but if I can bring that even lower with
>your idea, I shall.
>
>
>-- 
>Max Dillon
>Charleston SC
>'87 300TD
>'95 E300
>
>On September 7, 2015 11:23:48 AM EDT, Dan Penoff via Mercedes
><mercedes@okiebenz.com> wrote:
>>In an effort to address the remaining items on my list for the 94
>S420,
>>I started in this morning around 8:30.
>>
>>First thing was to add a couple of resistors to the coolant
>temperature
>>sensor for the auxiliary fans.  On the 95 and earlier W140 cars, there
>>is a sensor on the top front of the M119 engine that provides the
>>setpoint (100 C) for the turning on of the auxiliary fans.  I added
>two
>>2.2k ohm resistors in parallel to get the desired 1.1k ohm resistance
>>to lower the setpoint to around 92C.  
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