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Blower Motor Replacement
 
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Pelican Technical Article:

Blower Motor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

Phillips screwdriver

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Blower motor

Hot Tip:

Be careful not to damage blower housing

Performance Gain:

Replace faulty blower motor

Complementary Modification:

Replace blower motor and final stage together

BMW Z4 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 has 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.

If your blower motor fails, replace the blower and resistor together. You don't want to have to go back in if one fails later. Over time, a blower motor may become noisy as the motor electrical contacts wear. The blower fan cages also fracture, creating a vibration when the blower is ON. If it fails or becomes noisy, you can use this procedure for the repairs.

Replacing the blower motor is no easy task. You will have to work high up behind the instrument panel in an uncomfortable position. 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.

While in there, replace the cabin microfilter. It needs replacing every other oil change anyway and the dirt restricts flow and reduces heating and cooling efficiency.

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.

Start by disconnecting the battery. See our tech article for this procedure.

Remove the glove box and right side knee airbag. See the tech articles for the corresponding procedures.

Once the right knee airbag is removed, you have a clear view of the blower and final stage.
Figure 1

Once the right knee airbag is removed, you have a clear view of the blower and final stage. More instrument panel parts have to be remove to get them out, but you can test them at this point. When testing, you will have to reconnect the battery, which will set an airbag fault code when the airbag is removed. Keep this in mind, as this fault code will have to be cleared using an advanced BMW scan tool. The blower final stage is located to the left (red arrow) of the blower motor (blue arrow).

To remove the blower, start by removing the instrument panel support.
Figure 2

To remove the blower, start by removing the instrument panel support. Working below the fuse panel, remove the two Phillips head screws (red arrows).

Push the fuse panel toward the firewall as you pull it down, detach the top grommet (blue arrow) from the bore (red arrow) at the instrument panel.
Figure 3

Push the fuse panel toward the firewall as you pull it down, detach the top grommet (blue arrow) from the bore (red arrow) at the instrument panel. Be careful not to lose the rubber grommet, if you do, get a new one. You don't want a rattling fuse panel, as it could cause electrical issues. Once the fuse panel has been lowered, remove the two remaining Phillips head screws (purple arrows).

Working near the blower motor, remove the 10mm fastener for the instrument panel support (red arrow).
Figure 4

Working near the blower motor, remove the 10mm fastener for the instrument panel support (red arrow). Use a long extension, working from below the blower motor.

Follow the support to the right-near where the fuse panel mounts, remove the two 10mm fasteners for the instrument panel support (red arrows).
Figure 5

Follow the support to the right-near where the fuse panel mounts, remove the two 10mm fasteners for the instrument panel support (red arrows).

Remove the instrument panel support (red arrow) from the instrument panel.
Figure 6

Remove the instrument panel support (red arrow) from the instrument panel.

Grab the footwell duct (red arrow) and pull it down just enough to access the blower.
Figure 7

Grab the footwell duct (red arrow) and pull it down just enough to access the blower. Photo shows the duct in the position it needs to be in for access. Do not remove it.

Disconnect the final stage electrical connector by pressing the release tab (red arrow) and pull it straight out.
Figure 8

Disconnect the final stage electrical connector by pressing the release tab (red arrow) and pull it straight out.

Disconnect the blower motor electrical connector by pressing the release tabs (red arrow) and pulling it straight out.
Figure 9

Disconnect the blower motor electrical connector by pressing the release tabs (red arrow) and pulling it straight out.

Next, the flap actuator has to be removed.
Figure 10

Next, the flap actuator has to be removed. Disconnect the flap actuator electrical connector by (red arrow) pulling it straight out. Then unclip the tab (blue arrow) and pull the actuator straight out. Be sure drive on actuator is in same position as flap when reinstalling. Move flap as needed to align. 

Now it is time to remove the three blower motor screws.
Figure 11

Now it is time to remove the three blower motor screws. I like to use a long extension with a 1/4 drive T20 Torx bit or a 7mm socket, both will work as the fasteners have both options. Start with the top screw, then the lower two (red arrows). 

Install motor in reverse of removal.
Figure 12

Install motor in reverse of removal. Slide up, cage first. Be sure the mounting flange for the top most screw is orientated toward the top. It can be difficult to rotate once installed. Install screws and finally the electrical connector and trim panels. Reconnect the battery.

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Page last updated: Mon 12/5/2016 02:59:43 AM