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Outside Air Temperature Sensor Replacement
 
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Pelican Technical Article:

Outside Air Temperature Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$10

Talent:

***

Tools:

T25, T30 Torx

Applicable Models:

VW GTI (2006-09)

Parts Required:

New Temperature Sensor

Hot Tip:

Have a friend help

Performance Gain:

Proper working HVAC

Complementary Modification:

Clean out all the road debris behind bumper

If you are getting odd performance from your HVAC system there is a chance that the outside air temperature sensor is going bad. Replacing the sensor itself is easy and takes just a few minutes; unfortunately you need to remove the bumper cover to get access to it.

You do not need to lift the car or remove the wheels to take the bumper cover off, but it will give you more room to work if you do. If you want to lift the car please see our article on jacking up and supporting your vehicle for additional help

A great many of these cars have had the engine trays and front side shields removed over the years and not replaced.
Figure 1

A great many of these cars have had the engine trays and front side shields removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware here is what you need to do. There are four T25 Torx screws (red arrows) on each side holding the tray on, remove them and slide the tray back out of the friction clips (yellow arrows) on the front air dam.

Once the screws are removed slide the tray (red arrow) back and down.
Figure 2

Once the screws are removed slide the tray (red arrow) back and down.

To remove the lower wheel liner; begin by loosening the T25 Torx screw just in front of the strut (red arrow).
Figure 3

To remove the lower wheel liner; begin by loosening the T25 Torx screw just in front of the strut (red arrow). The liner is not actually screwed to it so you just need to loosen it enough to allow the liner to slip out.

There are four T25 Torx screws holding the lower liner to the vehicle Three in the front of the wheel well (yellow arrows) and one on the lower front edge (not shown).
Figure 4

There are four T25 Torx screws holding the lower liner to the vehicle Three in the front of the wheel well (yellow arrows) and one on the lower front edge (not shown).

With the Torx screws removed (red arrows) and the inner Torx loosed (yellow arrow) you can slip the liner down and out from the vehicle.
Figure 5

With the Torx screws removed (red arrows) and the inner Torx loosed (yellow arrow) you can slip the liner down and out from the vehicle.

From inside the wheel well looking forward you can see the side marker (red arrow), fog light (yellow arrow) and the head light washer nozzle (green arrow).
Figure 6

From inside the wheel well looking forward you can see the side marker (red arrow), fog light (yellow arrow) and the head light washer nozzle (green arrow).

Remove the side marker by pressing in the clip on the edge rear edge (red arrow) and push the assembly out.
Figure 7

Remove the side marker by pressing in the clip on the edge rear edge (red arrow) and push the assembly out.

With the unit out of the bumper you can see the retaining clip (red arrow) and the wiring connection (yellow arrow).
Figure 8

With the unit out of the bumper you can see the retaining clip (red arrow) and the wiring connection (yellow arrow).

Pull the wiring (red arrow) straight back and off the plastic unit (yellow arrow), this will separate them and expose the bulb.
Figure 9

Pull the wiring (red arrow) straight back and off the plastic unit (yellow arrow), this will separate them and expose the bulb.

Back inside the wheel well you can see the rear of the fog light.
Figure 10

Back inside the wheel well you can see the rear of the fog light. The wiring harness (yellow arrow) connects to bulb (red arrow) which sits in the fog light assembly.

Turn the bulb base counter clockwise until the cut outs in the fog light assembly line up with the tabs in the bulb base (red arrow).
Figure 11

Turn the bulb base counter clockwise until the cut outs in the fog light assembly line up with the tabs in the bulb base (red arrow). If you want to leave the bulb in the housing simply unplug the wiring connection.

Remove the T25 Torx screw that attaches the bumper cover to the fender (red arrow, one on each side).
Figure 12

Remove the T25 Torx screw that attaches the bumper cover to the fender (red arrow, one on each side).

On the right side of the vehicle is the windshield washer reservoir.
Figure 13

On the right side of the vehicle is the windshield washer reservoir. Separate the quick disconnect connection for the head light washers (red arrow) by pushing in the connection and then pulling straight back. If there is fluid in the reservoir be prepared to catch it in a container when you disconnect the hose.

Remove the four T25 screws holding the bottom of the cover to the lower mount below the radiator (red arrows).
Figure 14

Remove the four T25 screws holding the bottom of the cover to the lower mount below the radiator (red arrows).

On the top of the bumper remove the two T30 Torx screws (red arrows).
Figure 15

On the top of the bumper remove the two T30 Torx screws (red arrows). You will need to remove the grill first. Please see our article on removing your grill for further assistance.

Slide the bumper forward and off the car.
Figure 16

Slide the bumper forward and off the car. If you could not reach the quick disconnect for the headlight washers from below you can reach it from above before you fully remove the bumper (red arrow).

There are two plastic connectors (red arrows) that the cover sits in on each side, make sure these line up and connect when reinstalling.
Figure 17

There are two plastic connectors (red arrows) that the cover sits in on each side, make sure these line up and connect when reinstalling. You can see from this photo that the hoses for the headlight washers are incorporated into the bumper cover (yellow arrow)

This photo illustrates the female end that the bumper cover clips fit into (red arrows, one on each side).
Figure 18

This photo illustrates the female end that the bumper cover clips fit into (red arrows, one on each side). Installation is the reverse of removal. Do not use force; everything should line up nice and easy.

With the bumper cover removed you can see the outside air temperature sensor (red arrow) along with the electrical connection (yellow arrow) in front of the radiator on the left side of just below the bumper.
Figure 19

With the bumper cover removed you can see the outside air temperature sensor (red arrow) along with the electrical connection (yellow arrow) in front of the radiator on the left side of just below the bumper.

The end of the sensor is plastic (red arrow).
Figure 20

The end of the sensor is plastic (red arrow). You can gently squeeze the end of the sensor in with your hands and wiggle it out of the mount.

With the sensor out of the mount unclip the wiring connection (red arrow).
Figure 21

With the sensor out of the mount unclip the wiring connection (red arrow). Installation is the reverse of removal. Since you went to all this work you might as well give the front of the radiator assembly a good cleaning while your there.

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Comments and Suggestions:
Josh Comments: I need to know where the outside temp sensor wire leads to as well. My wife ran over something and ripped it out. She has a 2008 Jetta 2.0. Thanks in advance for your help!
May 14, 2016
  Followup from the Pelican Staff: I would assume to the body module.



I would grab a repair manual. It will have the wiring and module location.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Jetta1015 Comments: Where does the actual outside air temperature sensor wire lead to? Mine has ripped and haven't been able to figure out where it leads back to
April 4, 2016
  Followup from the Pelican Staff: On what vehicle? - Nick at Pelican Parts  
omat Comments: How do u remove it the sensor from the clip??
April 29, 2015
  Followup from the Pelican Staff: Step 20 shows the sensor being removed. It is held in by four clips. Squeeze the clips toward each other as you pull it up. - Nick at Pelican Parts  

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