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Oil Cooler Temperature Sensor Replacement
 
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Pelican Technical Article:

Oil Cooler Temperature Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$90

Talent:

**

Tools:

10mm socket, 19mm wrench, Philips screwdriver

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Temperature Sensor

Hot Tip:

Oil is going to leak out so be prepared

Performance Gain:

Proper oil temperature

Complementary Modification:

Oil and filter change

Oil is the life blood of the engine in the Porsche 993. Proper maintenance, cleanliness, viscosity and temperature are very important for that engine to have a long and happy life. There is a reason why you drive easier while it is warming up or if it gets too hot. The oil in the engine is designed to operate a maximum efficiency within a certain temperature zone. To help achieve this operating zone Porsche installed two oil temperature sensors; one on the engine and one on the oil cooler in the right front of the vehicle.

The oil cooler temperature sensor senses the temperature at the cooler and sends this signal to the climate control system that turns on the auxiliary cooling fan when necessary. There is no error code if the sensor goes bad so before replacing it please see all of the trouble shooting test in the article on how to replace your oil cooler fan first. If you know the sensor to be bad this article will show you how to change it out.

You will need to remove the front right forward wheel well liner. Some people say you can remove the liner and replace the temperature sensor with the wheels on; I recommend you safely lift and support the front of the vehicle. Please see our article on safely lifting and supporting your Porsche 993 for additional instructions.

A small amount of oil is going to escape from the cooler while you are doing this, so be prepared to catch it with a rag and dispose of it according to the regulations in your area. It is best to do this job while the oil is cold; this will decrease the flow and save you from burning yourself around the cooler.

To remove the forward liner begin by removing the Philip head screws including the three that join the liners on the top (red arrows).
Figure 1

To remove the forward liner begin by removing the Philip head screws including the three that join the liners on the top (red arrows).

Working under the vehicle remove the two 10mm plastic nuts holding the liner to the forward protection tray (red arrows).
Figure 2

Working under the vehicle remove the two 10mm plastic nuts holding the liner to the forward protection tray (red arrows).

There are two pieces of weather stripping on the forward liner (red arrows).
Figure 3

There are two pieces of weather stripping on the forward liner (red arrows). Once the liner is removed this is a good time to clean these out and get some rubber protectant on them.

You need to remove the liner from the wheel arch as this makes it easier to get off the air duct on the inner fender well.
Figure 4

You need to remove the liner from the wheel arch as this makes it easier to get off the air duct on the inner fender well.

With the liner removed you can see the oil cooler along with the two lines.
Figure 5

With the liner removed you can see the oil cooler along with the two lines. The temperature sensor is located on the top of the cooler right below the lines (red arrow).

I have removed the fan to get a better picture but you do NOT need to do this to replace the sensor.
Figure 6

I have removed the fan to get a better picture but you do NOT need to do this to replace the sensor. Squeeze in on the metal tab on the wiring connection (red arrow) and pull the connection off the sensor.

Use a 19mm wrench and remove the sensor from the cooler.
Figure 7

Use a 19mm wrench and remove the sensor from the cooler.

Be prepared with a rag to catch the small amount of oil that will flow out.
Figure 8

Be prepared with a rag to catch the small amount of oil that will flow out. If the oil is cold and you are quick you will not lose much at all.

The new sensor should come with its own new crush washer, but if for any reason you are installing the old one, always install it with a new crush washer.
Figure 9

The new sensor should come with its own new crush washer, but if for any reason you are installing the old one, always install it with a new crush washer. Installation is the reverse of removal.

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Page last updated: Sat 10/21/2017 03:15:03 AM