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don't know about the relay, it uses a resistor pack, two of them, one hidden the console and the other at the fan itself. There is a good you-tube video on the resistor pack replacement that is the console location. It's tricky, but it faily often.
BEST TO LET BMW DEALERSHIP REPLACE HEATER BLOWER IF NOT MISTAKEN YOU HAVE TO DISCHARGE AC SYSTEM TO REMOVE REFRIGERANT LINES TO REMOVE BLOWER MOTOR COVER.THIS IS NOT HOME FIX.BMW CARS NOT EASY TO WORK ON.YOU HAVE TO BE BMW MECHANIC TO WORK ON THEM.
The blower motor relay is located in behind the climate control center mounted to the ac box.The window relays are located in the power distribution center under the hood number k-5 and k-7.
The blower motors on this vehicle lis located underneath the dash. The upper half of the dashboard is removable and entails removing the spedometer cluster. The airbag also needs to be removed to get to some usually white triangular looking nuts that hold the wooden trim above the glovebox. Removal of the front side panels to the left and right of the windsheild is also required. If this helps; the blower motor is located right below the large center vent in the center of the dash.
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