Yeap ... I have the same thing going on too in my 92 500E. My MB Technician said it could be High/Low Pressure issues in the AC system ( ... $$$$). I hope not. It could also be bad sensors (AC system).
I'll report any new info as I get it ...
1992 500E (Daily Driver)
2004 Porsche RUF 955 Dakara 550