by John Scherrer » Mon Jan 11, 2021 3:29 pm
As I recall, the electric water pump is part of the supercharger option kit.
It is in addition to the stock mechanical water pump and I think only kicks in when the electric radiator fan is called and also continues to run for a time on engine shutdown when of course the mechanical pump isn’t working.
This is to avoid any local water boiling that would lead to an air lock and creating damaging hot spots.
After a heated drive, you can stop with fan going. If you stop the engine by switching the ignition off, the fan cuts too. If you just turn the ignition on again, the fan will restart and cutoff when the radiator water has cooled. Don’t leave the car and forget to switch the ignition off though !
I’m not suggesting that you should do this, it may just be better than leaving the engine idling until the fan cuts out.
As I recall, the electric water pump is part of the supercharger option kit.
It is in addition to the stock mechanical water pump and I think only kicks in when the electric radiator fan is called and also continues to run for a time on engine shutdown when of course the mechanical pump isn’t working.
This is to avoid any local water boiling that would lead to an air lock and creating damaging hot spots.
After a heated drive, you can stop with fan going. If you stop the engine by switching the ignition off, the fan cuts too. If you just turn the ignition on again, the fan will restart and cutoff when the radiator water has cooled. Don’t leave the car and forget to switch the ignition off though !
I’m not suggesting that you should do this, it may just be better than leaving the engine idling until the fan cuts out.