There are 2 screws which hold the blower motor switch in place. They are behind the narrow woodgrain panel. Pull off the knob from the speed selector switch, CAREFULLY pry the woodgrain panel off (if I remember correctly, it is just glued in place), then remove the switch via the 2 screws.

Replace the switch and re-install. Then enjoy the cool air.

SteveM

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner