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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