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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:

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

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 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 also 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, it's best to 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.

A faulty final stage could cause the blower to run on and off at varying speeds, without input from the driver. Or it may 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.

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. See our tech article for this procedure.

Remove the right side knee air bag. See our tech article for this procedure. 

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).

Start by moving the footwell duct out of the way.
Figure 2

Start by moving the footwell duct out of the way. BMW mentions removing the IHKA panel to access the duct, but I have never had to do this. I can always get it detached by simply pulling it down. Grab the footwell duct (red arrow) and pull it down just enough to access the blower, it will detach from the heater housing (blue arrow). 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 3

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

Remove the final stage Phillips head screws (red arrow).
Figure 4

Remove the final stage Phillips head screws (red arrow).

Push the final stage toward the right side, then slide it (red arrow) out of the heater housing to remove.
Figure 5

Push the final stage toward the right side, then slide it (red arrow) out of the heater housing to remove. To install, place final stage into heater housing, then slide it to the left to engage the mounting tab. Install the screw, then the electrical connector. Reconnect electrical connector and trim panels.

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Page last updated: Sat 12/3/2016 03:02:23 AM