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I have a 530d year 2000 and I have a problem with the heater speed control unit, I started the car the other day and put the air con on full, a minute or so later I smelt something burning, I switch the heater control off. I put the air con on low a few minutes later and there was no smell of burning, but every time I switch the heater on it blast out full power when it’s on low, now and then it starts to work properly. I have tried another heater control unit, but it’s just the same. I have been looking for the relays for the heater motor, but the only relays I can find are in the boot and they are ok. Can anybody help?
 
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