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 
<> 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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