PeachParts Mercedes-Benz Forum - View Single Post

lsmalley · #7 07-10-2017, 11:15 AM

Quote:

Originally Posted by tjts1

The viscous clutch fan on these cars is marginal in this type of weather. You absolutely need to the aux fans on in order to keep the engine cool while sitting in traffic at 100f. Do the "cool harness" modification to keep the aux fans running in this weather.
Auxillary Fan Turn-on Set Point Resistor Modification - Mercedes-Benz Forum

Might be something wrong with his aux fan wiring or sensors. If they aren't engaging at near redline, then there is a definite problem.

To the OP, if you are in Norway and you are having trouble being able to diagnose your aux fans/sensors because temps don't get that high, try removing the coolant temp sensor and using a heat gun on the probe with the KOEO and see if the fans kick on. At least this way you can get somewhat of an idea where the problem is. I think you should have a 2-prong sensor and a 4-prong sensor. The 2-prong sensor would be the one that activates the high speed fans.