For my castle sidewinder SCT which comes with a fan for the motor. i pull the acing off of the fan to use just the fan. I'm going to put on the ESC. but which direction do I want the fan to be? Either drawing air out of the ESC or pulling air into the ESC? what direction?

you want it to blow air onto the esc.

I thought the proper way was to have the fan blow up since heat rises and it would be more efficient for the fan to pull heat away from the heatsink

thats what i thought as well. but i put the direction of the propeller towards the esc. its not getting hot any more. plus its easier to put onto the esc with exhaust towards the fins

Its more efficient blowing down. If its blowing away from the esc its only really moving the hot air that's already dissipated by the heatsink. If its blowing on the heatsink it'll help cool it with the incoming air.

True, but that incoming air would be partly warm. Where as if it pushed the hot air away, it would also be pulling cold air through the fins of the esc.

Idk, either way would probably work. I gave up on my sidewinder after it overheated and the thermal didnt trip. (yes I had the fan on it. But the fan blade broke and got jammed.) Sent it in along with $75 and my new mmp should be at my doorstep sometime this week.

They're basically, well not basically, they are a little box fan. Not even sure they still make them anymore. You know the 2ft x 2ft fans about 6in deep...Turn it on and put your hand in front of the intake side, then on the outlet/blowing side, take a guess which side is moving more air.

esc fans are designed to push air not pull it. It has to do with blade shape and pitch.

IDK of any esc that comes with the fan NOT blowing on the heat sink

+1 never thought of it like that but thanks for the info
When I replaced the fan in my MMM I placed it blowing up but now il change it to face downward

is there a better fan than the one that comes with the castle sidewinder SCT?

You might want to check out some yeah racing fans

like from what place/website?