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Anybody knows where are the relays for the radiator fans?


Go to solution Solved by scottmc,

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  • Admin

so, most likely it's a connector to the fan issue or the whole fan needs to be changed...

thanks!

joel

I would put Durametric, PST2 or PIWIS tester on it before I started replacing large parts.

Just as likely (IMHO) a control box issue. But check the connectors first.

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  • Admin

I've done many upon many cooling fan resistors and complete fan assemblies on 996's so I imagine the 997 is similar. The resistors clip near the bottom of the fans in front of the wheel wells.

Cheers

No resistors on 997-1. The fans are controlled by electronics with their own control box.

From the Tech Book for the 997-1...

"An infinite fan control for the radiators has been introduced with the 3.6 litre and 3.8 litre engines of the new 911 Carrera and 911 Carrera S. This new feature permits infinite control of the fan speed as a function of the coolant temperature and the system pressure in the air conditioning system instead of two-stage control. It has the advantage of requiring less current and therefore creates less of a load on the

vehicle electrical system.

With staged control, when a temperature threshold was exceeded the next fan speed had to cover all of the allocated temperature range. With infinite control, the fan speed can be continuously adjusted to the actual requirement. This means that the fan speeds can often be reduced, thereby decreasing noise and vibrations."

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  • Admin

Loren, is the fan control unit on the driver's side or passenger side of the front luggage area? I never know what right or left means when talking about cars! :)

Yes, right is as you sit in the car - so on US/Canada cars that would be passenger side.

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Mine is a right hand drive car, so it is the driver's side for me!

It is close up to the side of the luggage compartment, right behind the fan unit, and from the diagram in the workshop manual it would be easy to mistake it for being inside. Just take off the wheel arch liner and you can't miss it, as you can easily see where the fans connect.

I wasn't sure if it was the fan or control unit, so (as someone has already suggested) I put a 12v supply direct to the fan, and it ran, so I knew it must be the control unit.

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  • Admin

You could test the fan motor directly by applying 12 volts positive at the fan wire connector junction point (remove wheel well liner to access).

Or unplug the fan and stick a volt meter in the socket.

I am not sure that will work - I think these are stepper motors now and they get a square wave as I recall.

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  • 2 months later...

Thanks to this thread I too solved my right side fan issue. Just some gravel stuck in the fan. Works fine now. Sure pays to participate....cheers to all.

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