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Blower Motor Final Stage Replacement
 
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Pelican Technical Article:

Blower Motor Final Stage Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

T20 Torx driver

Applicable Models:

X3 E83 (2004-06)
X3 E83 facelift (2007-10)

Parts Required:

Blower motor final stage

Hot Tip:

Be careful not to damage blower housing

Performance Gain:

Replace faulty blower motor final stage

Complementary Modification:

Replace blower motor and final stage together

BMW X3 vehicles can come equipped with one of two climate control systems. IHKS manually controlled climate control. Or IHKA, automatic climate control. Each has multiple sensors, controls, air temperature units and ducts. IHKA having additional components to handle auto temp control. The blower motor which controls air flow into the passenger cabin, is among the most consequential components in the climate control system. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit.

A faulty final stage could cause the blower to run on and off at varying speeds, without input from driver. Or to only run at high speed. If you suspect your blower final stage or blower are faulty, see our tech article on blower motor and final stage testing to confirm your suspicion.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Remove the glove box. See the tech articles for glove box removing.

Once the glove box is removed, you can see the final stage (red arrow) but it is still blocked (inset).
Figure 1

Once the glove box is removed, you can see the final stage (red arrow) but it is still blocked (inset). A few more components have to come out. You'll need to pull the lower trim off, duct and HVAC actuator. See the following steps.

Start by pulling the lower trim down and out of the side knee bolster (center console).
Figure 2

Start by pulling the lower trim down and out of the side knee bolster (center console). Disconnect electrical connector by pulling it straight out (inset).

Then pull trim toward rear of vehicle to remove.
Figure 3

Then pull trim toward rear of vehicle to remove.

Then pull the footwell duct out of the center console.
Figure 4

Then pull the footwell duct out of the center console. Detach the two connection in the center console by pulling it toward the right side footwell. Angle the duct down and feed it out of the center console.

Next, remove the HVAC door rod from the actuator (blue arrow).
Figure 5

Next, remove the HVAC door rod from the actuator (blue arrow). Use a flathead screwdriver and gently lever it up (red arrow). Be sure to support the actuator lever while prying, it is made of plastic and too much force may break it.

Remove the two T20 Torx actuator mounting screws (red arrows).
Figure 6

Remove the two T20 Torx actuator mounting screws (red arrows).

Pull the actuator straight out of the HVAC housing to detach tab at firewall (blue arrow).
Figure 7

Pull the actuator straight out of the HVAC housing to detach tab at firewall (blue arrow). Then disconnect electrical connector by pulling it straight out (inset).

You now have access to the final stage resistor (red arrow).
Figure 8

You now have access to the final stage resistor (red arrow). I have not seen an X3 with fasteners in the resistor, if your vehicle has fasteners remove them. Disconnect the final stage electrical connector by pressing the release tab (blue arrow) and pull it straight out.

Push the actuator rod (red arrow) all the way to the firewall.
Figure 9

Push the actuator rod (red arrow) all the way to the firewall. Then release the clip (blue arrow) and slide the final stage out of the heater housing. You may need to lever the retainer tab toward the firewall using a flathead screwdriver while pulling the final stage out. It can be a tough to free up. But work smart and gently, take your time, it will pop out.

Then slide it out of the heater housing to remove.
Figure 10

Then slide it out of the heater housing to remove. To install, place final stage into heater housing, then press the mounting tab toward the final stage to engage it. Install the electrical connector. Reinstall actuator, duct and trim panels.

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Page last updated: Tue 9/19/2017 03:32:45 AM