my 05 636 runs pretty damn hot! where on the radiator should i mount the second fan? on the same side next to the other? or maybe on the opposite side of the other blowing air into the radiator? post pics of yours if your useing two. if you can

 

I havent done it, but Im just saying, why not put em both side by side? Seems most logical.

 

i agree side by side should be the best. for some reason fans are more efficent on a radiator when they pull and not push.

 

someone posted up some pics of a 636 radiator and all he did was get another 636 fan and he turned it upside down and it bolted right up to the tabs that were all ready there