Four Seasons HVAC Blower Motor Resistor 20421
Four Seasons HVAC Blower Motor Resistor 20421 - view 2
Four Seasons HVAC Blower Motor Resistor 20421 - view 3
Four Seasons HVAC Blower Motor Resistor 20421
Four Seasons HVAC Blower Motor Resistor 20421 - view 2
Four Seasons HVAC Blower Motor Resistor 20421 - view 3

Blower Motor Resistor for 2004-2010 BMW X3 & More - Four Seasons 20421

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$64.99
MPN: 20421
Item Package Quantity: 1
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Four Seasons HVAC Blower Motor Resistor P/N:20421
Four Seasons HVAC Blower Motor Resistor P/N:20421
$64.99

Keep your cabin fan running at the speed you choose with the Four Seasons HVAC Blower Motor Resistor / Control Module, part number 20421. It fits many vehicles, among them the 2004-2010 BMW X3, 2001-2006 BMW M3 and 2000-2006 BMW X5, and is a direct-fit replacement for the listed applications.

Four Seasons describes this part as an HVAC blower motor control module. It is also listed as a blower motor resistor and as a switch, and all three names refer to the same part. It regulates the power sent to the heating and A/C blower motor so the fan runs at the selected speed. If a failed resistor is why your blower works only on certain settings, this part replaces it.

  • Quality contacts: designed to maintain proper conductivity.
  • OE-style connectors: make the electrical hookup to the vehicle harness.
  • Engineered and tested: Four Seasons engineers and tests its products with the goal of years of trouble-free operation.
  • A/C experience: backed by more than 50 years of Four Seasons mobile A/C know-how.

See the Buyer's Guide tab for the full list of vehicles.

Interchange: 85106011500 · 64116920365 · 64116923204 · 64116929486 · 64118364173 · 64118377579 · 64118383835 · 64118385549 · ACB0268P · 973528 · 1711977 · A06771 · SW9955 · SW9955C · JA1754 · JA1775 · RB1029

This part cross-references / interchanges with the following part numbers:

85106011500, 64116920365, 64116923204, 64116929486, 64118364173, 64118377579, 64118383835, 64118385549, ACB0268P, 20421, 973528, 1711977, A06771, SW9955, SW9955C, JA1754, JA1775, RB1029

Frequently Asked Questions

What does this blower motor resistor / control module do?

It regulates the power sent to the HVAC blower motor so the fan runs at the speed you select. Four Seasons lists 20421 as an HVAC blower motor control module.

Is this the right X3 switch for blower speed control on a 2004-2010 BMW X3?

Yes. Part 20421 is listed as a direct-fit replacement for the 2004-2010 BMW X3. The Buyer's Guide tab shows every vehicle it fits.

Can I use it as a switch replacement on a 2000-2006 BMW X5, and does it also fit the 2001-2006 BMW M3?

Yes. It is listed for the 2000-2006 BMW X5 and the 2001-2006 BMW M3. See the Buyer's Guide tab for the other BMW models it fits.

What are signs the blower motor resistor may need replacing?

Common signs are a blower that runs only on some speeds, stays on one speed, or does not run at all. A motor, fuse or wiring fault can cause the same symptoms, so diagnose the cause before replacing.

What features does the Four Seasons 20421 have?

It has quality contacts for proper conductivity and OE-style connectors. Four Seasons backs it with more than 50 years of mobile A/C experience.

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