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Coolant Temperature Sensor Replacement
 
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Pelican Technical Article:

Coolant Temperature Sensor Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$6 to $22

Talent:

*

Tools:

19mm wrench

Applicable Models:

BMW E10 2002 Coupe/Conv (1967-76)
BMW E21 320i Coupe (1977-83)

Parts Required:

Sensor

Hot Tip:

Work on a cold cooling system

Performance Gain:

Working temperature gauge

Complementary Modification:

Flush cooling system

If the temperature gauge in your BMW 2002 has stopped working there is a good chance that the coolant temperature sensor has failed. Replacing the coolant temperature sensor is one of the easiest jobs you can do on your 2002 and a great way to start DIY-ing your car.

The sensor is located on the top of the motor on the coolant pipe that comes out of the head. It is at a high point in the cooling system so you can change it out without a lot of coolant loss. Just make sure you perform the work while the system is cold and NOT under pressure.

The sensor is located on the top of the motor on the coolant pipe that comes out of the head (red arrow).
Figure 1

The sensor is located on the top of the motor on the coolant pipe that comes out of the head (red arrow). It is at a high point in the cooling system so you can change it out without a lot of coolant loss. Just make sure you perform the work while the system is cold and NOT under pressure.

The coolant pipe from the head contains both the cooling fan sensor (red arrow) and the temperature sensor (yellow arrow).
Figure 2

The coolant pipe from the head contains both the cooling fan sensor (red arrow) and the temperature sensor (yellow arrow). The fan sensor is to the left of the temperature switch and has two prongs, while the temperature sensor only has one.

The temperature sensor has a single pole on the top so simply slip the wiring connection off the sensor.
Figure 3

The temperature sensor has a single pole on the top so simply slip the wiring connection off the sensor.

Due to the location and height of the sensor in the cooling system you can replace this sensor without a lot of loss of coolant.
Figure 4

Due to the location and height of the sensor in the cooling system you can replace this sensor without a lot of loss of coolant. We are working on the Clarion Build's BMW 2002 with a fully restored engine. We performed the work without draining the system. Just make sure the coolant and engine are cold and there is no pressure in the system. Some coolant may escape so be prepared to catch it with a shop rag. Use a 19mm wrench and remove the sensor.

Due to the location of the sensor's port very little coolant should come out (red arrow).
Figure 5

Due to the location of the sensor's port very little coolant should come out (red arrow).

When installing the new sensor make sure it has a new crush washer.
Figure 6

When installing the new sensor make sure it has a new crush washer. You are installing the sensor with an aluminum crush washer on an aluminum pipe so you do not need to over tighten this when installing. Installation is the reverse of removal. There will be a small air bubble that will move through the system. If you have any concerns you can follow the instructions on how to bleed the coolant system by referring to the coolant flush and fill article.


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Page last updated: Mon 8/21/2017 03:05:22 AM