I have disassembled my radiator auxiliary cooling fan electric motor. It had what appears to be a resistor which bridged the connection to the positive connection to one of the brushes.
The ohm meter showed a broken connection here, so I removed this "resistor" which left the connection direct to the brush. I reassembled the motor and now it operates fine.

Question: What did this electrical device do? Was it like a rheostat which controlled the fan speed? Was it a thermocouple ?

SInce the fan is now functioning without it, I don't understand its function.

ANy ideas or reason why I should be worried about my fan motor?

Thanks.

I'd look at the electrical diagram to see if there's a resistor in the circuit--if the resistor is internal to the motor it probably won't show up on the schematic. The fan runs at a single speed unlike the cabin blower motors which use resistors to modulate fan speed. High coolant or refrigerant temperatures actuate the supplementary fan, which can actually limit the ram-effect cooling if the fan is running all the time--good luck



Tim Kraakevik
kraakevik@voyager.net

What made you think it was a resistor? Was it perhaps a tightly wound wire in the shape of a helix (think half of a DNA strand)?

__________________
1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

shortsguy,
what I called a resistor is soldered in parallel with the coil of wire like you described. I figured in worked with the wire coiled, but I can't figure it out.

I will just run it and see what happens.

Thanks to all for the input.

MAP