Hi, sorry to resurrect this old thread.... this seems closest to my problem and I didn't want to post without at least searching the forum history first!
I initially thought my X250 fan woes were the plug-in resistor, so I swapped that. When I did, I noticed melted cable sheath on the black wire and the plug was slightly deformed - I swapped the plug too.
That job needed doing, but my problem remains.
The fan only works intermittently on 0 or 1 - I don't know how high the fan goes, but on 0 it is still pushing air with a decent wooosh.
I don't have aircon.
When it's working, the dash lighting for the fan/heat dial iluminates with the headlights, when it's not, the lighting goes out too. The fan direction dial lights up fine.
Jiggling the switches makes no difference - it works or it doesn't. I wonder if the dude who drove this van before me attempted some percussive maintenance on the controls when the resistor burned out.
I'm thinking a loom or the switch, but before I start tearing the dash apart, I thought I'd better ask the forum if there is a best first place to start?