Quote:
Originally Posted by Knightrider966
I disagree that the AUX fan has nothing to do with Coolant temps. Running it will help keep your engine cooler in stop and go driving and my fan will cycle on when my AC is not running when my engine heat reaches 100C! My 300d is a 1983 and has two sensors for activation. I don't know if all have this feature, but it sure is nice! A second sensor is something I would consider adding if you live in an area with hot summers!  |
The aux fan is certainly related to overall engine temps, but what I meant is that there is no direct coolant temperature sensor that turns on the aux fan, only a refrigerant temp sensor on the dryer that closes at 144*F. This is all according to the wiring diagram in the FSM for your model year 83 300D (same for 84 and 85). I'd be interested to know where the extra temp sensor is on your vehicle and how it was added to the circuit. I've though about adding a manual switch in the cabin to turn on the aux fan, but don't know if it's really necessary.
