Mod to fix or replace castles crappy ESC fan?

[stum]

It's funny w/ my tekno conversion all of this last season I could run as much as I wanted pack after pack after pack and never overheat... now that I'm running the losi conversion, something about it and my ESC overheats.. I'm only geared 13/48 and there is no binds anywhere, basically stock w/ my MMM system, speed is nice not out of control but the heat just builds up faster. I just dropped a kyosho plastic 44t spur in to see if the gearing will help, but I highly doubt it, sometimes when everything else is cool and the ESC is not the system is undergeared.. if that doesn't work, I'll drop to a 50t spur and see what it does.

Back on subject if the fan wasn't junk I wouldn't have to worry about any of this.. guess it's time for me to cut the top off and take matters into my own hands.