MMP Fan

Well took the MMP for a rather low run today. When i came off, the esc was quite hot (considering how long i had been running it for & wether temps). But the fan had not come on. Usually when i first plug in a batt, the fan will turn on for a split second, i guess to 'engage' or something to tell the user it works. But lately it hasnt been doing that. I will take it out to see if there is a loose connetion or any damage, but im pretty sure it will be fine. My last race meeting was a little muddy, i saw some mud around the top of the cage of the fan, but removed it straight away after seeing it...