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Normally on older BMW's this is the "final stage resistor". In German they just call it a switch though. I know on my e36 and e39 this switch is like $140. When it fails the blow motor wil work sometimes and other times the display will show a the fan working but you won't have any output of the fan/air. And the heater goes all crazy too. It puts out high heat when you don't want any heat. Not sure if they also go bad on 1er's but its a good bet.
Btw... you have Klima automatic right? With teh digital display. You can read the fault memory and see if there is any code. You need a BT scan tool though.
Dack
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