My 325i has had a fan/blower problem for the past year or so where it will only work once in a while. when it is working it will not blow on low speed, only high. Las nite I cranked up the heat and put the front defroster on and within a minute there was smoke coming out of the defroster vents and the smell was like burning rubber. what could this be? It doesn't happen with the A/C or just the blower with no heat.
Smoke from defrost vent & burn smell on 2001 BMW 325i
by Visitor in San Ramon, CA on July 22, 2010
ANSWER by Chow on July 23, 2010
Have you got the ventilation button on "auto"? You might possibly have a leaking cylinder head cover gasket and the burning smell is drawn into the cabin. It is also possible a component has failed and emitting an unpleasant smell. Without having smelt it, i nor dealt it or know exactly what is burning Best to have it check asap by your nearest BMW dealer or mechanic, which can be located in the "find a shop" tab above.
ANSWER by Hal... on November 24, 2010
You either have a bad blower motor or your pulling in dirty outside air from a leaking valve cover gasket where oil is hitting the exhuast manifold. Bring it by when you a chance and happy holidays.