Where is the cooling fan relay located on a 2005 Volkswagen Jetta?

@alexander31 The Fan Control Relay is bolted beneath the battery tray. That's a known failure item when the fans are inoperative. Part number is: 141-951-253-B

The Fan Control Module is on the lower driver side of the radiator...

Or it can be located on the driver side lower frame rail." This is what it looks like (just a different number :) Hope this helps, good luck.

If unsure, always check your fans. With the A/C on the cooling fans should work. If they don't come on, it's the control module. If the fans work with the A/C on then check #16 fuse in the car and the fuses on top of the battery (S164 and S180)