Radiator Fan Constantly On

[Cammyron]

Hi All,

The radiotr fan in my 2009 MB Titanium TDCi is stuck on, even when the car is turned off. Just started doing it the otehr day out of no where and ran the battery flat. I know it runs for a little bit sometimes after being turned off but after 15 minutes its still going.

After looking around it seems it is either a stuck relay or a buggered controller module.

I thought i would try easy first and yank the relay to see if it was dodgy. No matter which relay i take out from the fuse/relay box under the bonnet the fan keeps going. I find that rather odd, shoudln't one of them (assumingy R7 or R5 that control that part) make the fan stop when it is yanked out? Does anyone know what relay i should be pulling or is there somethign else i am missing here.

Thanks