Im not sure how it is on a 93, but there should be 2 screws where the 2 top center vents are. Then 2 screws at the bottom center side vents. Im not sure if you have an ashtray or not. But theres 2 screws for that too. Then you should easily have access to the blower switch.

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1985 Mercedes 190E 2.3(Sold)