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Pelican Technical Article:

Oil Cooler Fan Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$170 to $450

Talent:

**

Tools:

10mm socket, Philips screwdriver, trim removal tool, multi-meter

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:

Fuse, relay, fan

Hot Tip:

Give everything behind the liner a good cleaning

Performance Gain:

Proper oil cooling

Complementary Modification:

Change your oil and filter

The Porsche 993 has an oil/air cooled engine and part of that cooling system is the forward mounted oil cooler. This cooler is located in the front right wheel well just behind the bumper. The cooler has an auxiliary fan attached to it to draw air through the cooler when it is not getting enough air flow. Low air flow, when you are idling or stuck in traffic, will cause the oil temperature to increase. There really are only a couple of ways to tell if your fan is starting to fail; one is that the oil temperature will be higher and the other and more common is that it will start making noise while operating. If the fan starts to make noise you should replace it right away because it is an important part of the oil and engine cooling system.

If the fan is not operating before replacing it make sure to check your fuse and relay and then check that power is actually getting to it.

You will need to remove the forward right wheel well liner and lower tray to access the fan. While some people say you can remove the liner and replace the fan 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.

If your fan is not working you should start diagnosing the problem by checking the fuse and relay.
Figure 1

If your fan is not working you should start diagnosing the problem by checking the fuse and relay. Open the hood and pull back the carpet. The relay and fuse box is below the right side A-pillar in the front. Release the two clips and open the lid (red arrows).

Check with the manual for your vehicle and inspect the fuse.
Figure 2

Check with the manual for your vehicle and inspect the fuse. On our project car the oil cooler fan fuse was number two and 30 amps (red arrow).

If the fuse is good check the relay with the good spare you should be carrying.
Figure 3

If the fuse is good check the relay with the good spare you should be carrying. Again check with your manual but the red arrow indicates the oil cooler fan relay on our vehicle. If the fuse and relay are fine then you will need to remove the right front wheel well liner to check for power to the fan and/or replace it.

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 4

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 5

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 6

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 7

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.

While professional mechanics will remove the fan without removing the under tray, I do not recommend it.
Figure 8

While professional mechanics will remove the fan without removing the under tray, I do not recommend it. It is a tight space to work in to begin with and any extra room I have to work in I appreciate. Remove the lower tray by unscrewing the three Philips head screws (red arrows).

Slide the tray forward using a trim removal tool to help release the plastic tabs holding it in place (red arrows).
Figure 9

Slide the tray forward using a trim removal tool to help release the plastic tabs holding it in place (red arrows).

Remove the drain tube from the fan and place it up out of the way.
Figure 10

Remove the drain tube from the fan and place it up out of the way.

Unplug the electrical connection by pulling it straight up (red arrow).
Figure 11

Unplug the electrical connection by pulling it straight up (red arrow). You can now use your multi meter to check for voltage to the fan.

Use a 10mm socket and remove the four nuts holding the fan to the cooler (red arrows), you will need a short extension for the front upper nut.
Figure 12

Use a 10mm socket and remove the four nuts holding the fan to the cooler (red arrows), you will need a short extension for the front upper nut.

Working at the front, remove the weather stripping on the lower piece (red arrow) and gently push back the plastic surround to bet the fan off the cooler.
Figure 13

Working at the front, remove the weather stripping on the lower piece (red arrow) and gently push back the plastic surround to bet the fan off the cooler.

You can now remove the fan and its housing from the cooler.
Figure 14

You can now remove the fan and its housing from the cooler.

While you have everything out make sure to give this area a good cleaning.
Figure 15

While you have everything out make sure to give this area a good cleaning.

Take the fan and housing to your bench and remove the three 10mm nuts holding the fan to the housing and remove the fan making sure to note the orientation of the switch.
Figure 16

Take the fan and housing to your bench and remove the three 10mm nuts holding the fan to the housing and remove the fan making sure to note the orientation of the switch.

Check the fan housing for crack or damage and make sure all of the weather stripping is there.
Figure 17

Check the fan housing for crack or damage and make sure all of the weather stripping is there. If the weather stripping between the cooler and housing is missing or old and brittle make sure to clean up the old stuff and install some new weather stripping. Installation is the reverse of removal.

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Page last updated: Fri 6/23/2017 03:14:37 AM