Heater problem
2002 BMW 318 4 cyl Two Wheel Drive Manual 34884 miles
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When the heater is switched on in the auto setting and temp of say 19-20 c. The fan starts to blow harder as the car compartment gets warmer. I then have to lower the fan blowing by manual control. This has been happening since I used my car phone charger. It was fine before that.

Thanks for helping.

Sounds like a possible final stage failure. Part# 64-11-9-929-486