Hobbywing 150A Ezrun esc review

[truggyracer1]

i just got my 150a today and installed it the esc is very big my question is the red/black wire that is coming out of the esc is that for the fan and is it necessary to hook up and i'm assuming that would get hooked up to the batt/telem spot on my RX?? i'm running on dirt and at times a dusty track is this a good idea? does it need to be connected the instructions dont even show it??? the rest of the esc i can figure out! thanks in advance for the help!