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Originally Posted by Donfico  I checked on sensor plug thermal, The fan works on high speed only but not low speed. It means relay issue? |
Most likely cause for your symptoms is the low speed resistor is burned out. Check relays with a multimeter or test light. If the low speed relay works, then that resistor is the culprit. I've heard of people getting a resistor from Radio Shack rather than BMW, something like 5 ohm 10 watt, but don't have the exact info any more.