Perhaps these engines just don't like getting a bath?   I leave mine nice and dirty, then I know it can't get any dirtier!
As for the fan running, I believe the temperature switch on the A/C Recieiver dryer can fail in an open or closed postion....yours may have failed in the closed position, causing the fan to run no matter what....
__________________
-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
|