The blower control unit is mounted to a metal bracket directly under the windshield behind the glove box . It is fairly close to the right side. It is a little tough to see as there are wire looms in the same area. You should see a silver box control unit for the HVAC system and directly to the right is the black control unit for the blower. I have both a 1982 CD and a 1985 300D and they are both the same.