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Re: Rad fan dosen't run after engine off !



> 
> The injector cooling fan on the turbocharged motors does serve a purpose 
> after the engine is shut down however.  The intent of the injector cooling 
> fan is to minimize the probability that the fuel lines and injector will 
> get so hot that vapor lock will occur and improve hot starting performance.  


	Just looked at my Bentley, and it says that the after-run feature is
	a "modification" to improve hot starting performance -- suggesting
	that all cars do not have it. This also suggests the probable reason
	for the divergence of "after-run" experience, as it were.


	So looks like you're right on the money: non-turbo cars don't have
	the injector cooling fan, so maybe the after-run is all you can
	do to reduce underhood temperatures.
> 
> I was not clear on my major point though.  Although many manufacturers 
> allow the rad cooling fan to run when the engine is off, and some use 
> water-jacketed turbos, I am aware of no others that have an electrical 
> water pump to cool the turbo after the engine is shut down.  There prob-
> ably is someone else out there that does so, I'm just not aware of it.


	I'm reasonably sure that late-model 300ZX's and Saab 9000 Turbo's
	have some cooling mechanism for the turbo which avoids the necessity
	of idling them before shutdown -- don't know if it's an electrical
	water pump.

	-Arun