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Air Duct Temperature Sensor Replacement
 
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Pelican Technical Article:

Air Duct Temperature Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$60 to $200

Talent:

***

Tools:

Mercedes-Benz tool 140-589-02-33-00, trim removal tool

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Sensors

Hot Tip:

Make sure the tools are set before pulling on them

Performance Gain:

Proper HVAC controls

Complementary Modification:

Change cabin air filter

There is a temperature sensor in each of the side air ducts on the Mercedes. If one of these sensors fails it can cause problems with your HVAC system and throw an error code. If you have patience and smaller hands it is possible to change out the sensors through the air duct vent openings.

You are going to pull the air duct vent to access the sensor.
Figure 1

You are going to pull the air duct vent to access the sensor. If you are planning on working on the interior of your Mercedes a good tool to own is the Mercedes 140-589-02-33-00, While you can make your own, this tool is indispensable for removing vents, ducts, gauge clusters etc. If you would like to make your own tool take a piece of sturdy metal at least six inches long and bend one end 90 degrees leaving approximately 5mm on the bent end. You are going to need to pull pretty hard on the tool so make some sort of handle on the other end.

There are two slots on the bottom of both side vents (red arrows).
Figure 2

There are two slots on the bottom of both side vents (red arrows). Insert the tool and turn it 90 degrees so it sits in the slots on the bottom of the vent.

Make sure both tools are properly seated and then pull back and up (red arrow).
Figure 3

Make sure both tools are properly seated and then pull back and up (red arrow). It is important that the tools are properly seated. You can really scratch up the vents if the tool slips.

Once the clips on the vent release you can remove it with your hands and then turn it over and disconnect the wiring connection (red arrow).
Figure 4

Once the clips on the vent release you can remove it with your hands and then turn it over and disconnect the wiring connection (red arrow).

The procedures are the same for both sides with the exception being you need to pull the gauge cluster trim piece out on the driver side.
Figure 5

The procedures are the same for both sides with the exception being you need to pull the gauge cluster trim piece out on the driver side. Please see our article on gauge cluster removal for additional assistance.

You can see in through the vent opening the sensor that is mounted below the air duct with the metal part of the sensor sticking up into the air flow (red arrow).
Figure 6

You can see in through the vent opening the sensor that is mounted below the air duct with the metal part of the sensor sticking up into the air flow (red arrow).

I could not show you what I was doing while I had my hand stuck in the vent opening so I shot this from below with the glove box removed.
Figure 7

I could not show you what I was doing while I had my hand stuck in the vent opening so I shot this from below with the glove box removed. If you cannot fit your hand in the opening you can remove the glove box on the passenger side and the under tray on the driver side and replace the sensor. Please see our article on these procedures for additional assistance. Turn the base of the sensor 90 degrees, and remove it from the duct.

Remove the sensor with the wiring connection attached and gently pull it out from the opening.
Figure 8

Remove the sensor with the wiring connection attached and gently pull it out from the opening. Disconnect the sensor and reconnect the new one. Try not to touch the metal part of the sensor with bare skin or anything that has oil or dirt on it.

When installing the vent place it in at a downward angle so the bottom clips seat last (red arrows).
Figure 9

When installing the vent place it in at a downward angle so the bottom clips seat last (red arrows).

The side vents can be difficult to seat sometimes so a trick is to pop off the side panel and help guide them in place by hand.
Figure 10

The side vents can be difficult to seat sometimes so a trick is to pop off the side panel and help guide them in place by hand. Use a trim removal tool and gently pry away the side panel from the end of the dash (red arrow).

With the clips released pull the panel forward and away from the dash.
Figure 11

With the clips released pull the panel forward and away from the dash.

You can now reach your hand in behind and help guide the vent into place.
Figure 12

You can now reach your hand in behind and help guide the vent into place. Installation is the reverse of removal.

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Page last updated: Fri 12/2/2016 02:55:38 AM