I did not know that either. I will have to pay more attention next time I drive the car.

 

I don't know if the fan is on or not whenever the engine is on, but I find that would be extremely unlikely. Maybe someone else can chime in.

 

I called my service guy at Porsche and he is going to check and call me back later today.

 

I was told the following from the Porsche service director in NB. The engine fan threshold temperature is 20 Centigrade (67 Fahrenheit). Anything above this temp, the fan will turn on. He could not confirm that the fan is on at all times when the engine is running. Only that the thermostat triggers the fan at temps above 67 F.

 

Always a good thing to take the car for a ride for a couple of miles after heats to cool it down also

 

Just go out and crank your car...get out and go to the back and look into the closed deck lid (or even open the rear deck lid)...see for yourself....the fan is running.

 

You're talking about when the engine is shut down? That the fan turns on if the engine bay exceeds 67F? That sounds like way too low a temperature. I come back from drives where the engine bay temp has to be WELL in excess of 67F, and the fan never turns on.

 

I suspect it is just like he 996. On at engine compartment temp of about 180F or when coolant temp exceeds about 220.

 

I have also experienced the same observation. I talked to the Dir. of Service and he was reading a logical wiring schematic. He is a good friend of mine and wanted to try to find the answers for me.

I will take a look next time I drive the Porsche.

 

With the engine shut down? That sounds like a more reasonable temperature.

 

The fans regulator is not reading oil or water temp, just ambient air temp. Technicians test the thermostat by placing it in hot water to trigger the fan.

 

In addition to monitoring the engine bay temperature, the coolant temperature is also monitored and the fan will kick on if the temp get above a certain level, whether or not the engine compartment is hot.

 

So with all the above new info about this fan, what is the most efficient way to cool the engine after hard runs at the track? Just leave it alone and let it do what it does or open the lid and put fan on engine??
Currently I do the later? Thoughts? Jim?

 

First why the need to cool the engine fast? You mean before your next run? There are of course a number factors that will play a role...ambient temperature and relative humidity (dew point) for example. The key is to not destroy your turbos by not having them cool properly...for this I think the advice is to run you car at idle for at least 2 minutes before shutting down.

 

It would depend on the size of the fan, and where you located it.

A fan that moves more air than the OEM fan, positioned so that it's blowing down on the engine from close to the same location that the OEM fan is in with the lid closed, should provide better cooling.