Blown Fuse
Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."
Bad Blower MotorIf the fan only works on setting number 3 or 4, or just on the highest setting, it is most likely that your blower motor is failing and is about to die. Use a voltmeter to test the amount of voltage at the blower motor connector with your ignition on and AC running. If it reads 12V, the motor needs replacing.Automatic Climate Control SystemAnother thing that causes the blower fan to malfunction is the Automatic Climate Control System (ACCS). If the ACCS's settings are off, it may cause the fan to stop working. If it is the climate control on the car, typically it is a bad thermostat or electrical circuit that is the culprit.
hope this helps, James Booth
SOURCE: A/C blower works noly in High
4 wire Connecter
Remove lower left trim panel from instrument panel.
Remove knee protector (USA only).
Disconnect connector (2).
Pull out resistor for heater - A/C fan (1) in direction of arrow (as shown) and remove.
Behind center of dash board left
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SOURCE: dash lights not working 96 bmw 318
dimmer switch is on the dash on your r/s and must be replaced
SOURCE: BMW Fan blower has been replace twice, now 8 months
Got to be the switch, or the resistors in the blower, or the blower its self. The best thing to do is to take it back to the dealer warranty should be for a year and I don't know when you bought the vehicle but the entire vehicle may still be under warranty. check it out. But the items listed above are what they should be testing . There may be a technical service bulletin for this problem. you could check this out on line at Edmuns .com or BMW's web site. Good luck
SOURCE: a/c fan blower 1997 BMW 740i Not turning on
clogged, fuse, resistor, bad fan,relay, in that order
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