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I'm interested in hearing more responses to this. When I start my truck in the morning after 2 or 3 minutes the fan runs really fast. From what I understand this is to put drag on the engine to help it warm up. After it gets warm, I can hear my fan cycling up and down at idle. It never completely shuts off. I have read that this may be the "unique fan" that is part of the snow plow prep. But, I have also read other threads that seem to say that other owners have taken their trucks into the dealer for this and they have replaced the fan clutch. So just looking for more replies to this topic and see how others with snow plow prep fans run.
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