Pelican Parts
Mercedes-Benz Parts Catalog Accessories Catalog Mercedes-Benz How To Articles Mercedes-Benz Tech Forums
Call Pelican Parts at 888-280-7799
View Recent Cars  |Shopping Cart Cart | Project List | Order Status | Help
 >  >
Ambient Air Temperature Sensor Replacement
 
Bookmark and Share

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 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.

Bookmark and Share
Comments and Suggestions:
Vega Comments: I have a w204 c300 2011 the ac fn is funny works properly then only hot air an obd scanner gives p009a is this sensor responsible for cool air from the ac
September 3, 2017
  Followup from the Pelican Staff: What is the fault code description? Does your tool read specific system faults? - Nick at Pelican Parts  
gsc Comments: Hello
I'm looking for connection or plug of sensor outboard temperature for Mercedes C250 2012. Where I can find it ?
August 3, 2017
  Followup from the Pelican Staff: it should be located at the lower center of front bumper.- Nick at Pelican Parts  
Hot in Charlotte Comments: I have a w208 convertible will this sensor affect the temperature of the A/C ...it will blow cold air then the air is not as cold ..like the A/C not working ..
July 30, 2017
  Followup from the Pelican Staff: Possible low charge or the cooling fan is not working. Check system pressure when the prob,e is present, what is pressure? What is ambient temp? - Nick at Pelican Parts  
Marcus Comments: My aircond is acting funny, almost everytime I turn it on after a while the cool is gone or minimised. Need to restart the engine to get it working properly again. Just replaced the compressor and still not fully working. Mine is w204 c250cgi 2010 model. Any suggestion
July 27, 2017
  Followup from the Pelican Staff: Check system pressure when the prob,e is present, what is pressure? What is ambient temp? - Nick at Pelican Parts  
David Comments: Couldn't avoid it a dog ran out in front of me and I kill it so now my car is mess up recently replace bumper now can't find where my outside air temperature was also missing a connector for right fog light have 4 wires hanging please help thanks alot 06 Mercedes Benz c 230
July 16, 2017
  Followup from the Pelican Staff: I’m not the best with part numbers, I am the technical question person.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
sami Comments: the out side temp was giving incorrect reading and now shows - f my question is does this stops the A/C from working I have c300 2010
June 30, 2017
  Followup from the Pelican Staff: Should not stop it from working. The sensor is likely disconnected or faulty. - Nick at Pelican Parts  
Sara Comments: Where do u buy the wire conectoon
June 27, 2017
  Followup from the Pelican Staff: Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Dazza Comments: 1. Would damaging this sensor Cracking its base in a light front end bump the wife tapped a car with a tow bar that reached this sensor nicely, cause the check engine yellow light to come on? The display doesn't show outside temp any more just -.-C 2. Would driving short trips in winter cause any damage to engine? 3. If replacing this fixes display problem, is there a cheap faultmate/similar IID tool or similar I could buy to clear the fault?

Thank you heaps for an awesome site ;
June 13, 2017
  Followup from the Pelican Staff: 1. This sensor will not usually cause a check engine light.

2. No, as long as the engine is warmed up.

3. An OBD scan tool should be able to clear engine fault codes. - Nick at Pelican Parts
 
Mark Comments: Getting intermittent correct/incorrect readings on outside temp gauge, lack of climate control adjusting fan speed when AC is cooling properly, and intermittent cooling from the AC - when it works it cools properly. Do these symptoms indicate faulty outside temp sensor? 2010 C300. Thanks in advance!
May 14, 2017
  Followup from the Pelican Staff: it could. At certain temps, the DME may kill the compressor. I would begin by replacing the sensor, or repairing the wiring, whichever is causing the wrong reading. - Nick at Pelican Parts  
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  

QUICK LINKS
About Us
Careers
Pelican Parts, Inc.
1600 240th Street
Harbor City, CA 90710
Order Online or Call:
888-280-7799
CONNECT WITH US
NEWSLETTER
Sign Up for Pelican Pit Stop News & Special Offers
Page last updated: Mon 10/23/2017 03:01:55 AM