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Auxiliary Fan Replacement
 
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Pelican Technical Article:

Auxiliary Fan Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$80 to $425

Talent:

**

Tools:

8mm socket, universal joint, Philips head screwdriver, cutters

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Fan

Hot Tip:

Clean behind the fan

Performance Gain:

Proper A/C cooling

Complementary Modification:

Recharge the A/C

The auxiliary fan on the front of the A/C condenser is used to pull more air through the condenser as the A/C heats up. The fan is controlled by a temperature switch on the receiver/dryer and should activate when the temperature reaches 126 F. This will draw more air through the coils and keep the system within its proper operating parameters.

Before you replace the fan make sure to check your A/C system. Low pressure and a leaky system can lead to other faults and replacing the fan is not cheap.

The fan is relatively easy to replace, just be sure to be careful when working around the A/C condenser as the fins on it can easily be bent or damaged. (Note: Damaged or bent fins will impair the air flow to the condenser and cause it to work poorly or not at all. They are also not cheap to replace.)

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.

The fan is located in front of the A/C condenser (red arrow) and is easy to replace.
Figure 1

The fan is located in front of the A/C condenser (red arrow) and is easy to replace.

The electrical connection for the fan will run up the left side brace; use a set of cutters and carefully cut the zip ties making sure not to cut the wires (if you are removing it to test) and do not damage the condenser.
Figure 2

The electrical connection for the fan will run up the left side brace; use a set of cutters and carefully cut the zip ties making sure not to cut the wires (if you are removing it to test) and do not damage the condenser.

There are two 8mm bolts holding the fan to the brackets (red arrow).
Figure 3

There are two 8mm bolts holding the fan to the brackets (red arrow).

Use an 8mm socket with a Universal joint to get the head of the ratchet away from the condenser.
Figure 4

Use an 8mm socket with a Universal joint to get the head of the ratchet away from the condenser.

On the lower mount you can use a Philips head screwdriver to remove the mount from the lower cover.
Figure 5

On the lower mount you can use a Philips head screwdriver to remove the mount from the lower cover.

You can now slip the fan out from the front, carefully working the lower mount around the cover.
Figure 6

You can now slip the fan out from the front, carefully working the lower mount around the cover.

You can access the electrical connection in the lower front left wheel well (red arrow).
Figure 7

You can access the electrical connection in the lower front left wheel well (red arrow).

It is a tight fit but reach up and slip the connection out from its bracket and unplug it.
Figure 8

It is a tight fit but reach up and slip the connection out from its bracket and unplug it. Installation is the reverse of removal.

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Page last updated: Wed 1/18/2017 03:04:03 AM