The air vent system will or is now inoperative because the vacuum pods diaphrams tear causing most of the air to go to the windshield instead of vents. The pods can be repaired for less than $10 each or new ones are $50 - 60 each. I think there are 5. Some of the pods require the dash to be removed to replace. Nice car if you can do your own repairs otherwise $$$$$. May be cruise control issues - used ones avail, window motors and or the plastic clip that holds the motor cable. Used motors ~ $50, plastic clips ~ $8. Maybe someone else can add more to answer your question. I think price is good for a well cared for 190.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K