Can't help with wipers, but maybe with fan. If the switch is stiff, the switch unit may be b******d, like mine was, or the operating cables hidden in the back which operate the flaps in the air ducts may be seized or out of adjustment.
Does it look roughly like this?:
Then the back looks (roughly) like this:
Those levers wear or weaken and stop moving the cables, which themselves can get stiff, causing or compounding the problem.:
The only answer I found was to replace the whole unit, which is doable for an idiot like me with lots of patience. Expensive though, new.
There are a number of different versions, with different levers on the back, so make sure you get the right one (VIN number needed)
If you want to tackle the job yourself I'll dig out the notes I made on the job, which I've so far been too shy/lazy to turn into a HowTo! Hey, it's about time I did it anyway. Should be able to get it up by tomorrow.