Magic Blower (HVAC)
My first post here. I live in Germany and drive a 2008 525d. Have been driving the car for three years and everything has been great. Raked up 100K miles. I have been taking the car to the dealership for maintenance because I like to trade it in soon. Lately a first issue arose, which I like to fix myself if possible.
The issue is, after driving for approximately 1 hour and 15 minutes, the HVAC blower starts blowing harder, then softer again, the harder again, and softer, and on and on. Sometimes itkeeps blowing hard, sometimes it goes back to soft again.
My 1989 Porsche 928 has a resistor pack which controls blower speed and if that pack goes south the same thing happens. I have no idea how blower speed is controlled in my E60 though.
Anyone have encountered this problem and any ideas to fix it?