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Replacing Your Mercedes-Benz Auxiliary Fan
 
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Pelican Technical Article:

Replacing Your Mercedes-Benz Auxiliary Fan

Steve Vernon

Time:

1 hour1 hr

Tab:

$100

Talent:

*

Tools:

8mm, 10mm wrenches

Applicable Models:

Mercedes-Benz W126 (1981-91)

Parts Required:

New Fan

Hot Tip:

Clean behind the fan

Performance Gain:

Engine runs at the proper temperature

Complementary Modification:

New thermostat

Mercedes-Benz Auxiliary fans can and do fail. The fan is mounted in front of the radiator and is susceptible to damage from road debris.

The fan is relative easy to replace and should not take you much time at all. One of the tricks I like to use is to remove the upper left mount rather than just the screw that attaches the fan to the bracket. This will give you a little more room to wiggle and adjust the fan in its mounts.

Open the hood and follow the wiring harness from the fan to the connector by the A/C lines. Remove the connection from the clip and pull the connection apart.

Next remove the 8mm screw holding the fan to the horn bracket.

Remove the lower 10mm screw connecting the fan to the cross member.

You can remove the 8mm screw connecting the fan to the upper cross member bracket but I prefer to remove the two 10mm screws holding the bracket to the cross member and remove the mount with the fan.

Slip the fan out and replace.

This photo illustrates everything you will be working on to remove the fan: The wiring harness (yellow arrow), the 8mm horn bracket screw (green arrow) and the three 10mm screws mounting the fan.
Figure 1

This photo illustrates everything you will be working on to remove the fan: The wiring harness (yellow arrow), the 8mm horn bracket screw (green arrow) and the three 10mm screws mounting the fan.

Follow the wiring harness from the fan to the connector and remove it from the clip (red arrow).
Figure 2

Follow the wiring harness from the fan to the connector and remove it from the clip (red arrow).

Separate the connector by simply pulling it apart (red arrow).
Figure 3

Separate the connector by simply pulling it apart (red arrow).

Remove the 8mm screw from the horn bracket (red arrow).
Figure 4

Remove the 8mm screw from the horn bracket (red arrow).

Remove the 10mm screw (red arrow) connecting the fan to the lower cross rail.
Figure 5

Remove the 10mm screw (red arrow) connecting the fan to the lower cross rail.

You can remove the 8mm screw connecting the fan to the upper cross member bracket (yellow arrow) but I prefer to remove the two 10mm screws (red arrows) holding the bracket to the cross member and remove the mount with the fan.
Figure 6

You can remove the 8mm screw connecting the fan to the upper cross member bracket (yellow arrow) but I prefer to remove the two 10mm screws (red arrows) holding the bracket to the cross member and remove the mount with the fan. Installation is reversal of removal.

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Comments and Suggestions:
Baxslaw Comments: The flap controlling air flow appears to be stuck on defrost is there a way to fix this where it moves freely? The vehicle is a 1981 Mercedes 380sl
June 18, 2016
  Followup from the Pelican Staff: I would remove the actuator to confirm the flap is stuck and it isn't a vacuum loss to the actuator. - Nick at Pelican Parts  
Jack Comments: I have a 1984 Mercedes 300SD. I need the mounting brackets for the auxiliary fan. Do you carry them? What are they; and how much for them? I would need any hardware ie: nuts and bolt that are needed for the installation! Thank you!!!
June 26, 2013
  Followup from the Pelican Staff: This is the only bracket listed in EPC, the three fan mounting screws are not listed.
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_Search.cgi?SUPERCAT_FLAG=Y&make=MBZ&please_wait=N&forumid=&threadid=&description_side=126-620-04-85&GoSearchSideFlag=&command=DWsearch&command=DWsearch&REFINE=Y&FORUM_REFER=&SUPERCAT_FLAG=Y&make=MBZ&description=1266200485&x=26&y=12

-whunter-
 

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