Blower Motor: Testing and Inspection

Check the air inlet grilles for debris.

The blower motor can be checked by measuring its current draw at the blower motor fuse.

The blower is unit replaceable.

The fans are precisely balanced with clip-on weights. If the weights come off, the blower assembly must be replaced, since re-balancing is not possible.

Most current BMW vehicles (except the Z3) have microfilters. For details on microfilter replacement, see "Microfilter" (Pollen Filter).