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Pelican Technical Article:

Heater Blower Motor Replacement

Mike Holloway

Time:

30 minutes30 mins

Tab:

$50 to $300

Talent:

*

Tools:

Phillips head screwdriver, 10mm socket wrench with 6- inch extension

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

Blower motor

Hot Tip:

Count screws and bolts.

Performance Gain:

A warm interior when it's cold outside

Complementary Modification:

Replace heater coil

The blower motor is responsible for bringing heat into the cabin by way of passing air over a heater coil. The warmed air is circulated into the cabin. The motor which produces the air flow can fail. Replacing the motor is straightforward.

Start by removing the access panel located in front of the windshield under the hood.
Figure 1

Start by removing the access panel located in front of the windshield under the hood. Removal is accomplished using a Phillips head screw driver. It may be accomplished easier if the hood is removed. Please refer to the article concerning hood removal if you elect to do so. It's not required and is rather a matter of preference.

The screws located closest to the windshield may require the use of a Phillips head screwdriver drive on a 90°offset with a cordless drill.
Figure 2

The screws located closest to the windshield may require the use of a Phillips head screwdriver drive on a 90°offset with a cordless drill. The task can also be accomplished using a socket wrench and a Phillips head screwdriver bit.

Remove the access panel exposing the motor.
Figure 3

Remove the access panel exposing the motor.

Unplug the thermostat control line.
Figure 4

Unplug the thermostat control line.

Using a Phillips head screwdriver, unscrew the thermostat terminal.
Figure 5

Using a Phillips head screwdriver, unscrew the thermostat terminal.

Using a 10mm socket, loosen and remove the bolts holding the blower motor in place.
Figure 6

Using a 10mm socket, loosen and remove the bolts holding the blower motor in place.

Unplug the power source.
Figure 7

Unplug the power source.

Once the bolts have been removed the blower can be lifted out of the compartment.
Figure 8

Once the bolts have been removed the blower can be lifted out of the compartment. Installation is the reverse of removal.

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Comments and Suggestions:
John Comments: Re the enquiry from Theo. I am in a similar position in that top nuts holding the motor are fine and easy to remove but the bottom ones are well rusted and one has already sheared. Expect second one to do so as well. What form do these fasteners you suggest take and how are they installed. If it is a nut inserted from below then presumably a lot of interior dismantling is required to gain access. Would self tapping screws do the job?
June 17, 2016
  Followup from the Pelican Staff: If you drill out the old ones, you can retap the hole and use a size larger. The size and type will depend on your drill size. if needed, you can add rivnuts to the housing. - Nick at Pelican Parts  
Theo Comments: These screws holding the blower were really badly rusted, even with loosener, they broke... What would be your suggestion to fix the new one in place?
June 13, 2016
  Followup from the Pelican Staff: Drill out the old ones, then install new fasteners. Larger sized if needed. - Nick at Pelican Parts  
marco Comments: My heater blower don't work.what causes it can i have a clue
Please....thanks Marc
October 2, 2015
  Followup from the Pelican Staff: Fuse, control panel, bad resistor, bad blower motor. Start by checking the signal to the blower motor.- Nick at Pelican Parts  

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Page last updated: Wed 12/7/2016 02:26:00 AM