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The fan keeps the module box at a optimal temp-not too hot or cold. It draws in air straight from the cabin, making use of the climate controlled interior of the truck. Kind of the same idea as the small cooling fan your PC has.
It can cause a squeeking noise with the truck running or up to 5 minutes after shut-down. It runs at the same time as the aux cooling pump, same circuit.
It may be adviseable to put a few old towels on the left fender before doing this, and also disconnecting the battery.
It's way at the bottom of the box. It comes out fairly easy but can be a bit of a puzzle to reinstall.
We've tried lubing/cleaning, but it always comes back (sounds OK when it leaves though!). We just replace them, but I realize they are fairly expensive for what you get.
The instructions seem to be pretty good otherwise.
Gilly
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