I know I am beating a dead horse.

1989 300E


OK so I am trouble shooting my aux fan as it doesn't work. I have search through many other threads but have not seen one with pictures. Different people have been using different names for the same part which has lead to some confusion.

First I have put 12 volts directly to the fan plug and the fan spins.



I checked with volt meter that 12v is running across the fuse in the fuse D. Which is the fuse for the aux fan.



I checked with volt meter that 12v is running across the strip fuse.



I jumped the AC dry receiver together. I get a clicking noise from the relays behind the fuse box.



I jumped the temp switch and I get a clicking sound from the relay behind the fuse box.


I tested the resistor and got no voltage. I tried jumping the wires and still got not voltage.



I am not sure what else to check. I prefer not to trace every single wire in the whole system. Thanks for your help in advance.

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1983 240D Yellow
1989 300E Champigne
1993 190E Gray
1986 325 BMW Burgundy
1987 Chevy S10 Blazer