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Old 04-29-2015, 04:00 PM
renaissanceman renaissanceman is offline
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Join Date: Nov 2014
Location: Central CA
Posts: 694
The resistor is located behind the driver's side front headlight, and below the ABS pump on my 1987 300D. It supposedly is used to run the fan on at a reduced speed whenever the A/C is on as indicated by the high pressure switch...the location of which I am not sure of. Full speed fan is initiated by the temperature switch near the upper

I realized afterwards that the ambient temperature was in the 50F range, so it may not have been building sufficient pressure to engage the switch...

I need to jumper that or the engine temperature switch to see if the fan even runs, I suppose.
Mechanical Engineer -- I design and make otherwise unavailable car parts.


2005 Volvo S40 T5 AWD, 71k
1998 Saturn SL2, 244k - 35 mpg (gone, never forgotten)
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 155k - 28.7 mpg
1993 Tracker 4x4, 2 door, 8v, 3 sp auto. 134k - 25 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 108k - 28.6 mpg

WARNING: this post contains thoughts that may at any point be discovered by the state of California to cause cancer.
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