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Pelican Technical Article:

Auxiliary Fan Replacement

Steve Vernon

Time:

6 hours6 hrs

Tab:

$100 to $200

Talent:

***

Tools:

13mm, 10mm 8mm socket, Philips head screwdriver, trim removal tool

Applicable Models:

Mercedes-Benz 260E (1987-89)
Mercedes-Benz 300CE (1988-93)
Mercedes-Benz 300E (1986-93)
Mercedes-Benz 300TE (1988-92)
Mercedes-Benz E320 (1994-95)

Parts Required:

New fans

Hot Tip:

Order new plastic pins before you start

Performance Gain:

Cool engine

The two auxiliary fans (red arrow) are mounted in front of the engine fan, shroud, radiator and A/C condenser.
Figure 1

The two auxiliary fans (red arrow) are mounted in front of the engine fan, shroud, radiator and A/C condenser. Unfortunately they cannot be removed out of the front of the vehicle and everything behind them with the exception of the A/C condenser must be removed first.

Loosen the condenser from its mounts but not open the system.
Figure 2

Loosen the condenser from its mounts but not open the system. This way you will not need to evacuate the refrigerant or recharge the system later. There are two 10mm bolts that secure the condenser to the lower front section of the vehicle (red arrows).

Use a 10mm socket and remove the two bolts from the bracket (red arrow, one shown).
Figure 3

Use a 10mm socket and remove the two bolts from the bracket (red arrow, one shown).

On the left side of the condenser there is a small bracket that attaches the hard lines to the frame.
Figure 4

On the left side of the condenser there is a small bracket that attaches the hard lines to the frame. Use a 10mm wrench and remove the nut (red arrow). Note: Do NOT open these lines (green and yellow arrows) unless you have properly evacuated the refrigerant from the system. Leave these lines connected.

There are two plastic trim pieces; one on each side of the condenser (red arrows, already removed) that are held in place by two Philips head screws on each piece.
Figure 5

There are two plastic trim pieces; one on each side of the condenser (red arrows, already removed) that are held in place by two Philips head screws on each piece. Remove the screws and the pieces.

Gently pry up and remove the two clips on the top of the cross member that hold the condenser in place (red arrow, one clip shown).
Figure 6

Gently pry up and remove the two clips on the top of the cross member that hold the condenser in place (red arrow, one clip shown).

Lift the condenser up and tilt it back (red arrow) to give you access to get the fans separated from the condenser.
Figure 7

Lift the condenser up and tilt it back (red arrow) to give you access to get the fans separated from the condenser.

Move the condenser until you have enough room to get access to the fans and trim piece.
Figure 8

Move the condenser until you have enough room to get access to the fans and trim piece. Do not separate the A/C lines (red and yellow arrows).

The fan trim piece sits in a groove (yellow arrows) along the bottom of the condenser and is attached by 6 plastic push/pull pins.
Figure 9

The fan trim piece sits in a groove (yellow arrows) along the bottom of the condenser and is attached by 6 plastic push/pull pins. You can see the location of the pins by the red arrows).

Use a trim removal tool and remove the six pins (red arrow, one shown).
Figure 10

Use a trim removal tool and remove the six pins (red arrow, one shown).

The pins (red arrow) are designed to separate by the center section pulling out to remove and then pushing in to lock in place.
Figure 11

The pins (red arrow) are designed to separate by the center section pulling out to remove and then pushing in to lock in place. Be prepared as most of these will not co-operate and will usually break when you try and remove them. I recommend you order replacement pins before you start.

Separate the wiring connection for each fan (red arrow, one shown).
Figure 12

Separate the wiring connection for each fan (red arrow, one shown).

There are six 8mm bolts holding the fan to the condenser.
Figure 13

There are six 8mm bolts holding the fan to the condenser. Remove the two on the right side (red arrows) from the outside of the condenser.

I find it easier to remove the two on the left side from where the bracket meets the condenser (red arrows).
Figure 14

I find it easier to remove the two on the left side from where the bracket meets the condenser (red arrows).

Remove the two 8mm bolts in the center mount (red arrows).
Figure 15

Remove the two 8mm bolts in the center mount (red arrows). The fan will be free at this point so make sure it does not fall.

You can now remove the fans from the vehicle (red arrow).
Figure 16

You can now remove the fans from the vehicle (red arrow).

Make sure to clean out all the dirt and debris you will find behind the fans (red arrows).
Figure 17

Make sure to clean out all the dirt and debris you will find behind the fans (red arrows).

The fans can be replaced separately.
Figure 18

The fans can be replaced separately. They share a common mount in the middle and are secured by two 8mm bolts (red arrows).

If you are replacing the left side fan make sure to change over the mounting bracket and the two 8mm bolts (red arrows).
Figure 19

If you are replacing the left side fan make sure to change over the mounting bracket and the two 8mm bolts (red arrows). Installation is the reverse of removal.

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Comments and Suggestions:
wbensing Comments: Comments: One of my 2 aux fans is not running
What should I test before removing & replacing
October 23, 2016 Followup from the Pelican Staff: Is it getting power and ground when the right temperature is reached? - Nick at Pelican Parts

Is there an easy way of accessing the power plug that goes to the R aux fan, short of removing the radiator to get at it from the back ?
November 17, 2016
  Followup from the Pelican Staff: Trace the wiring from the fan to the e-box, you can likely test it at a junction along the way. - Nick at Pelican Parts  
Hal Comments: I have a 1991 Mercedes 300D 2.5L turbo diesel. Would you have a procedure for it or do you think this procedure should be pretty close?
November 3, 2016
  Followup from the Pelican Staff: Should be pretty close if not the same.



We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.


I would grab a repair manual. It will have the procedure, special tools and torque specs.


Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Wbensing Comments: One of my 2 aux fans is not running
What should I test before removing & replacing
October 23, 2016
  Followup from the Pelican Staff: Is it getting power and ground when the right temperature is reached? - Nick at Pelican Parts  
Billy Comments: My car shakes when the extra fan is working...the blades have no cracks..what should I look out for? E320 1995
February 17, 2016
  Followup from the Pelican Staff: The fan may have threw a weight of is damaged. I would replace it. - Nick at Pelican Parts  
Sub_zero Comments: Amazing write up...thanks a lot.
I have the mono aux. Fan,would this article be
Close to replacing it?
September 17, 2015
  Followup from the Pelican Staff: Yes, should be pretty close. - Nick at Pelican Parts  
Marc fritz Comments: Dear sir,as I turned the ignition on,the auxiliary fan is
On.what can be the problem.....Marc
July 12, 2015
  Followup from the Pelican Staff: Could be a faulty coolant temp sensor. - Nick at Pelican Parts  
quest1966 Comments: I may have found the part number. Multi-purpose rivet 123-990-00-92.
June 28, 2015
  Followup from the Pelican Staff: Thanks - Nick at Pelican Parts  
quest1966 Comments: Could you provide the part number for the plastic retaining pins? Thank you!
June 28, 2015
  Followup from the Pelican Staff: I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.

- Nick at Pelican Parts
 
yogib37 Comments: will these steps work for the same on a 1993 300D?
September 12, 2014
  Followup from the Pelican Staff: I don't believe so.
This tech article applies to:
300E (1985-92)
260E (1987-90)
300CE (1988-89)
300TE (1988-91)
300E2.6 (1990-92)
300TE 24 (1989-92)
300CE 24 (1990-93)
300E 24 (1990-93)
300CE (1993-94)
280E (1993-94)
300E2.8 (1993-94)
E280 (1994-96)
320TE (1993-94)
E320 (1994-96) - Nick at Pelican Parts
 

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Page last updated: Sat 12/3/2016 03:01:40 AM