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BMW E39 Blower Motor Final Stage Replacement
 
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Pelican Technical Article:

BMW E39 Blower Motor Final Stage Replacement

Kerry Jonsson

Time:

1.5 hours

Tab:

$40

Talent:

***

Tools:

Phillips screwdriver

Applicable Models:

BMW E39 5-Series (1997-03)

Parts Required:

Blower motor final stage

Hot Tip:

Since components are buried under the dash you will be doing much of the work by feel

Performance Gain:

Variable speed blower motor operation, eliminate battery drain

Complementary Modification:

Replace cabin micro-filters

The Blower motor final stage controls the variable speed of your blower motor. You make adjustments of your blower motor on your IHKA panel. The IHKA unit sends an electrical signal to the final stage and the final stage changes the blower motor speed. This final stage has been known to keep the blower motor running with the key on causing a battery drain. If you have a battery drain see if the blower motor is running (it may be running slowly and be almost silent) with the ignition key off.

There is a lower panel underneath the glove box in the foot-well area.
Figure 1

There is a lower panel underneath the glove box in the foot-well area. Grab the cover with your hand and pull it towards the back of the car. The panel will slide out and expose the area underneath the glove box.

There is a carpeted panel along the passenger side of the transmission tunnel.
Figure 2

There is a carpeted panel along the passenger side of the transmission tunnel. You may want to remove this to make things easier to see but you donÂ't have to, to access the blower motor final stage. There is a fastener that needs to be removed (green arrow) first before you can slide the panel off

Slide the panel (green arrow) towards the back of the car.
Figure 3

Slide the panel (green arrow) towards the back of the car. A couple of clips will come loose and you can pull the panel out of the way.

Once you remove the carpet panel, you will be able to see the final stage unit electrical connector (green arrow) sticking out above the HVAC duct.
Figure 4

Once you remove the carpet panel, you will be able to see the final stage unit electrical connector (green arrow) sticking out above the HVAC duct. Grab the connector and pull on it and you will pull out the final stage with it still attached.

Pull the final stage down to where you can work on it and squeeze both locking tabs on either side of the electrical connector and pull it straight out.
Figure 5

Pull the final stage down to where you can work on it and squeeze both locking tabs on either side of the electrical connector and pull it straight out.

Upon reinstallation simply plug in the new final stage and refit it.
Figure 6

Upon reinstallation simply plug in the new final stage and refit it. You will probably not be able to see the pin on the HVAC box since it is buried; there is a hole on the final stage body that has to align with this pin (green arrow). This keeps it in place so it doesnÂ't bounce around while the car is being driven.

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Page last updated: Wed 12/7/2016 02:05:09 AM