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Originally Posted by aklim
Mine cycles on briefly and then off when the car is set in the run position. NHDOC said he had a bad fan and it might be a variable speed one. Any one know if it is a fixed speed or variable?
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Does your aux fan come on with the AC? I was able to read some voltage at the plug when I turned the AC on, it started as a few volts and gradually got up to 9-10 and then dropped back again. That's why I think it is a variable speed fan which gets fed voltage according to what the AC unit needs.
I figured since it was non-functional I would remove the entire assembly until the replacement unit arrives. The silly thing is that it blocks a significant portion of the airflow if it is present but not working. I would say something on the order of 30-50% of the radiator's area is blocked either by the fan blades themselves or the frame around them. Removing them sure opens up the front for better airflow through the condensor and radiator.
I figure I could easily get away with leaving the assembly out because our weather is relatively cool most of the time. We rarely see 90°F+ temps but I think it is prudent to replace it so I ordered a new aux fan assembly and will install it when it comes in.