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Ambient Air Temperature Sensor Replacement
 
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Pelican Technical Article:

Ambient Air Temperature Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$17 to $40

Talent:

*

Tools:

8mm socket, flathead screwdriver, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

Sensor

Hot Tip:

The sensor just pops out

Performance Gain:

Proper HVAC information

Complementary Modification:

Clean up the underbody

The ambient air temperature sensor is used to provide the outside air temperature to the front SAM control unit and is used by the HVAC system. Replacing this sensor is simple and easy with the hardest part being jacking up the vehicle.

You will need to safely jack up and support your car. Please see our article on safely raising and supporting your Mercedes W204.

Remove the 8mm hardware that holds the front under tray in place and lower it down.
Figure 1

Remove the 8mm hardware that holds the front under tray in place and lower it down. If you need additional assistance please see our article on under body tray removal.

The sensor is located right in the center of the front under the radiator (red arrow).
Figure 2

The sensor is located right in the center of the front under the radiator (red arrow).

Squeeze in the tab (red arrow) on the wiring connection and pull the connection off the sensor.
Figure 3

Squeeze in the tab (red arrow) on the wiring connection and pull the connection off the sensor.

Use a small flathead screwdriver and gently pry the sensor out from the plastic hole it sits in.
Figure 4

Use a small flathead screwdriver and gently pry the sensor out from the plastic hole it sits in. This is just a friction fit. The sensor will just pop back into place. Installation is the reverse of removal.

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Comments and Suggestions:
Inga Comments: If the sensor does not work can it affect the fan of the car
March 9, 2017
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
Freedo Comments: Can outside sensor in my 204 Benz disturb the movement of the car when is bad or out of position ?
January 26, 2017
  Followup from the Pelican Staff: No. - Nick at Pelican Parts  

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Page last updated: Sat 4/29/2017 03:01:23 AM