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Radiator or Auxiliary Fan Switch Replacement
 
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Pelican Technical Article:

Radiator or Auxiliary Fan Switch Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$18 to $40

Talent:

**

Tools:

29mm deep socket, flathead screwdriver

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Auxiliary fan switch

Hot Tip:

Drain fluid below switch

Performance Gain:

Working fans

Complementary Modification:

Replace belts

The auxiliary fan switch is located on the left side of the radiator near the top of the radiator and just below the coolant hose. On the normally aspirated Porsche 944s, the switch is relatively simple to change out but on the Turbo there is a fair amount of work to get to it.

In either case you should be working on a cool vehicle, as you are going to need to drain enough fluid to get below the switch. Please see our article on coolant draining and flushing.

There are plenty of people that take short cuts when trying to replace the switch from not draining the coolant to trying to replace it, while removing as few components as possible. The simplest way to replace the switch with the least chance of breaking or cross threading anything is to follow all the procedures listed here.

The sensors come with different temperature ranges, so make sure you order the right one for your area.

The switch is buried down below the intake manifold intake tube, below the air box and under the coolant hose (red arrow).
Figure 1

The switch is buried down below the intake manifold intake tube, below the air box and under the coolant hose (red arrow). Remove the air box and intake tube. Please see our article on air box removal.

Next, remove the crossover tube (red arrow).
Figure 2

Next, remove the crossover tube (red arrow). Please see our article on crossover tube removal for additional instruction.

The switch is located below the upper radiator coolant hose (red arrow).
Figure 3

The switch is located below the upper radiator coolant hose (red arrow). Use a flathead screwdriver and remove the hose from the radiator.

With the hose removed, you can see the auxiliary switch just below the radiator opening.
Figure 4

With the hose removed, you can see the auxiliary switch just below the radiator opening. Disconnect the electrical connection for the switch (red arrow).

With everything out of the way it is easy to reach in.
Figure 5

With everything out of the way it is easy to reach in. Using a 29mm deep socket, simply unscrew the old switch and install a new one (red arrow).

This photo illustrates a new switch.
Figure 6

This photo illustrates a new switch. There is no room to get a wrench in to install the switch, so you must have a deep enough socket to fit over the switch for removal and installation. Make sure to not to cross thread it by installing it by hand until snug tight and then using a wrench. Always make sure to install a new gasket (red arrow) when installing the sensor. The sensors come with different temperature ranges, so make sure you order the right one for your area.


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Page last updated: Fri 5/26/2017 02:51:12 AM