Original BMW Blower Motor Resistor for E30 3 Series, M3, and Z3 (1985–2002)

The Original BMW blower motor resistor is the final stage unit that sets heater blower fan speed on E30 3 Series and M3 models from 1985–1993 and the Z3 from 1996–2002. BMW names it simply Resistor in its parts data, and the unit weighs 45 grams. Power enters the resistor at a steady value, and its output steps the blower motor up or down through each fan setting. Because it handles that current continuously, the resistor runs hot in normal service. It is a common failure item on BMWs of this era.

Original BMW Parts carry a 24-month parts warranty.

This number replaced the earlier 64-11-1-375-755, and BMW marks the change as exchangeable retrospectively, so the current resistor can go into cars that left the factory with the earlier part. Production of this version began in May 2000. BMW also cross-references 64-11-1-468-108 and 64-11-1-468-521 to this part. It is made in Slovenia and sold individually as one piece.

Technical Details

• Manufacturer: BMW (genuine part)
• Part number: 64-11-6-912-633
• BMW part name: Resistor (blower final stage)
• Supersedes 64-11-1-375-755, exchangeable retrospectively
• Also cross-referenced to 64-11-1-468-108 and 64-11-1-468-521
• Weight: 45 g (0.1 lb)
• Production start: May 2000
• Made in Slovenia
• Sold as: 1 piece
• Warranty: 24-month Original BMW Parts warranty

Common Questions

What symptoms point to a failed blower resistor?
The cabin fan stops working entirely, or it only runs on some of its speed settings.

My E30 has the older 64-11-1-375-755 resistor. Will this replace it?
Yes. BMW lists the newer number as exchangeable retrospectively, so it replaces the earlier part directly.

Why does the resistor get hot?
It manages a large amount of current to control fan speed, so heat during normal operation is expected.

Fitment & Compatibility

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