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Pelican Technical Article:

Blower Motor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$100 to $300

Talent:

**

Tools:

Philips head screwdriver, 8mm socket

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Blower motor

Hot Tip:

make sure to disconnect the battery

Performance Gain:

Working heat

Complementary Modification:

Detail the interior

The blower motor and resistor move the air through the HVAC system. If you are starting to hear a whining sound when the motor is running or the motor doesn't run at all there is a good chance that the motor is going bad. All kinds of things can end up in the top of the motor, so at the very least you should remove the motor, inspect it for debris and clean out the housing. On the W123 the blower motor is located under the passenger side of the dash above the footwell. You will need to remove the under dash panel to access the motor and wiring.

This is one of those spots where over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. 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. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please include your vehicle information.

Figure 1

Begin by disconnecting the ground terminal from the battery (red arrow) and placing it somewhere where it cannot come in contact with the post while you are working

To remove the panel, begin by removing the large plastic Philips head screws (red arrows).
Figure 2

To remove the panel, begin by removing the large plastic Philips head screws (red arrows).

Next remove the trim pieces if you have them and using a Philips head screwdriver remove the three screws (red arrows) holding the panel to the dash.
Figure 3

Next remove the trim pieces if you have them and using a Philips head screwdriver remove the three screws (red arrows) holding the panel to the dash.

Drop the panel down and make sure it is free and clear of everything and remove it from the vehicle.
Figure 4

Drop the panel down and make sure it is free and clear of everything and remove it from the vehicle.

With the panel removed you can see the blower motor (red arrow).
Figure 5

With the panel removed you can see the blower motor (red arrow).

Unplug the electrical connection by pulling the plug straight down (red arrow).
Figure 6

Unplug the electrical connection by pulling the plug straight down (red arrow).

Next use a Philips head screwdriver and remove the single screw on the plastic arm on the blower motor (red arrow).
Figure 7

Next use a Philips head screwdriver and remove the single screw on the plastic arm on the blower motor (red arrow).

Using an 8mm socket remove the three screws holding the motor to the housing (red arrows).
Figure 8

Using an 8mm socket remove the three screws holding the motor to the housing (red arrows).

The motor will now slip down out of the housing.
Figure 9

The motor will now slip down out of the housing. Installation is the reverse of removal.

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