Hi there, i have frequented the b5 s4 forum before now, i have just purchased a 07 S3, I have found that the smaller cooling fan has smashed itself to pieces leaving the motor hitting the engine when it engages, so i have removed it completely from the fan pack assembly. I only have the larger fan in situ at the moment. I have had a search online but cant seem to find anything specific, so was wondering if anybody can advise me on what both fans do (different temp levels) ? and if it would be a terrible idea to use the car with just the single (larger) fan. (which works) Many thanks for your help.