Heater Fan - BMW Forum

RallyE36 · 01-25-2004, 12:27 AM

I hope someone can help me with the following.
Lately while driving and the car has warmed up the heater fan starts picking up speed until it's blowing at full blast, while the light bar stays where it was (usually at a low setting). After about 2 - 3 minutes the fan speed goes back to normal.
I have also noticed today the temperature gauge needle moves from midway (straight up) back to about a quarter of the gauge.
Does anyone know what could be happening? Is the fan blowing harder to compensate for something that may be happening to the heating system?
Thermostat being stuck? I'm a bit at a loss here.

Thanks in advance.

Roy

Furious · 01-25-2004, 08:09 AM

its a possible problem with the thermostat.. keep an eye on your temp gauge.

TECH · 01-25-2004, 11:05 AM

It sounds like 2 seperate problems. I agree about the thermostat possibly being stuck open.
As far as the fan, it could be a fan speed resistor, or it your car has an auto function for the ac, then it is just doing it's job-when the ac is on auto, the fan speed can fluctuate.