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Fan Overide

By putting a resistor on your Rad fans circuit the high speed fan will cut in sooner.
Most people also fit a switch so it can be manually overridden.
 
Radiator Fan and Engine Compartment Fan Switch Mod


The 3.4 996 runs extremely hot when driving around town in temperatures higher than 75 degrees. This mod is a way to reduce coolant temps back to a safer level, helping to reduce oil temps and improving performance.

The mod consists of installing a switch that will allow you to turn on the high speed radiator fans at any time, while maintaining the automatic operation of the fans. This will help maintain engine temperatures below 200F at all times.

Radiator Fans

Connect a wire to the ground (Pin #85) of the 2 high speed fan relays located on the relay carrier located in the driver's side foot well. The relays are #20 and #22. Feed this wire to where your switch will be located. Connect the wire to one side of the switch. Connect another wire from the other contact on the switch and then connect the other end of this wire to a chassis ground point.

With key on, this switch will now immediately turn on both radiator fans providing maximum cooling. When you turn the key off, the fans will continue to run for about 5 seconds until the relay shuts down. Your fan operation remains normal when the switch is off.


(Not my work cut & Paste from another forum)

Ill post some Pic's when ive done it.
 
Can't you just put the A/C on? Seems to run all the time when I do, or at least as long as there is some dust to blow up over the hood around. [;)]
 
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