Have you tried jiggling the key to see if some position allows everything to work? I had an ignition lock assembly that wouldn't return the key from "START" to "RUN", had to move it manually. If it wasn't in the detent correctly the heater fan wouldn't work. Don't really know if anything else was affected.

At any rate, sounds like your ignition lock is starting to go. You should replace it before it locks the ignition permanently.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)