Funky outside temp display problem solved.
 

Yesterday, the outside temperature display on the C230 was locked at +15C. This was regardless of the actual temp being about 26C.

I called the dealer, and explained that the display seemed "locked." I had checked the sensor output through the diagnostics mode on the ACC panel, and the sensor was reading the proper temp, just not displaying it properly.

I shut the car off for a while, and came back. Same thing. Well, the dealer explained that they'd have to replace the sensor, the display, and a whole bunch of other parts.

Since they can't get the car in for two weeks, I thought I'd try something kinda novel. I pulled fuses 19 and 30, which are instrument panel fuses. I waited about 1 minute, and replaced them. Guess what? The outside temp display works just fine again. No problems encountered.

Microsoft would be proud! I just "reset" it...

next thing is to wire a keyboard to the fuse box so one can do the Bill Gates three finger salute (ctrl + alt + del). i ought to try this trick if there is a similar set of fuses in my car. strange but with the onset of 70 - 80 degree weather my lcd panel, which has been winking in and out, is now on solid. i have not been able to isolate this gremlin in my car. i even replaced the thermistor to no avail...

I've been thinking mine may have been "locking up" too. Maybe I'll try reseting mine, thanks for the tip.