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Coolant Temperature Sensor Replacement
 
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Pelican Technical Article:

Coolant Temperature Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$10

Talent:

*

Tools:

5mm Allen

Applicable Models:

VW Golf GTI (2000)
VW Golf GTI 1.8T (2002-05)
VW Golf GTI 20th Anniversary (2003)
VW Golf GTI 337 (2002)
VW Golf GTI GLS (2001)

Parts Required:

New coolant temperature sensor

Hot Tip:

Don't work on a hot engine

Performance Gain:

Piece of mind on engine temperature

Complementary Modification:

Coolant Flush

Replacing the coolant temperature sensor is a relatively easy job if you have a lot of patience. The sensor is located on the left side of the engine attached to the water pipe that comes out of the head. While it is not difficult to replace you will be working in a small and cramped environment.

Let the car cool so you don't have to work around a hot engine.

Begin by removing the engine covers. Please see our article on removing your engine covers.

The sensor is located under a bunch of vacuum and emission hoses. Begin by removing the large line to the airbox and then move whatever hoses you feel you need to give you enough rooms to get your hands in.

I have removed everything out of the way to give you a better illustration of what you will be doing but you do not need to move anywhere near the amount of lines shown in the pictures.

Remove the electrical connection from the sensor. Lift up the tab on the connector and then lift the connector off the sensor.

The sensor is actually held in place by a small clip that sits in a channel on the housing. Use a flathead screwdriver and pry/slide the clip back out of the housing.

Remove the sensor by pulling it straight up and out. Always replace the gasket anytime you remove or replace the sensor.

The housing can get road grime in it so make sure you take care not to get any into the pipe and give it a good cleaning before installing the new sensor, gasket and clip.

Installation is the reverse of removal.

The sensor is located under a bunch of vacuum and emission hoses (red arrow).
Figure 1

The sensor is located under a bunch of vacuum and emission hoses (red arrow).

Begin by removing the large line to the airbox (yellow arrow) and then move whatever hoses you feel you need to give you enough rooms to get your hands in.
Figure 2

Begin by removing the large line to the airbox (yellow arrow) and then move whatever hoses you feel you need to give you enough rooms to get your hands in.

I have removed everything out of the way to give you a better illustration of the sensor (red arrow) but you do not need to move anywhere near the amount of lines shown in thePictures.
Figure 3

I have removed everything out of the way to give you a better illustration of the sensor (red arrow) but you do not need to move anywhere near the amount of lines shown in thePictures.

Remove the electrical connection (red arrow) from the sensor (yellow arrow).
Figure 4

Remove the electrical connection (red arrow) from the sensor (yellow arrow). Lift up the tab on the connector and then lift the connector off the sensor.

The sensor is actually held in place by a small clip that sits in a channel on the housing.
Figure 5

The sensor is actually held in place by a small clip that sits in a channel on the housing. Use a flathead screw driver and pry/slide the clip back out of the housing (red arrow).

Remove the sensor by pulling it straight up and out.
Figure 6

Remove the sensor by pulling it straight up and out. Always replace the gasket (red arrow) anytime you remove or replace the sensor.

The housing (red arrow) can get road grime in it so make sure you take care not to get any into the pipe and give it a good cleaning before installing the new sensor and gasket.
Figure 7

The housing (red arrow) can get road grime in it so make sure you take care not to get any into the pipe and give it a good cleaning before installing the new sensor and gasket.

The new sensor comes with a new gasket and clip.
Figure 8

The new sensor comes with a new gasket and clip. Make sure you always replace these.

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Comments and Suggestions:
Hsh Comments: Whats the function ... U think that might help cool down the engine because it keeps getting hot .. i already replace the fan and radiator
February 6, 2017
  Followup from the Pelican Staff: The thermostat controls the minimum temperature of the engine, and the water pump controls the flow. I would check and replace these two if necessary. Here is a link to the thermostat article: http://www.pelicanparts.com/techarticles/Volkswagen_Golf_GTI_Mk_IV/39-WATER-Replacing_Your_Thermostat/39-WATER-Replacing_Your_Thermostat.htm
Here is a link to the water pump article:
http://www.pelicanparts.com/techarticles/Volkswagen_Golf_GTI_Mk_IV/39-WATER-Replacing_Your_Thermostat/39-WATER-Replacing_Your_Thermostat.htm
- Casey at Pelican Parts
 

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Page last updated: Sat 3/25/2017 02:36:25 AM