My aux fan is not working. I tested the connector with the engin really hot (approaching 115-120) and my test light blinks every 5 to 6 seconds without the motor engaging. Any clues? Is it a relay issue? strange the it would be at a regular interval.
Thanks for you help and thoughts. I have not tested the motor yet, but it appears to be a power supply issue...

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)