Thermal Dynamics... it's really pretty simple.
We used to run electric water pumps in the race cars (a loooong time ago) but found that the cool coolant will migrate based on where the heat is.. Hot goes up, cool goes down. After that modified water pumps (for less flow and less hp draw) were used.
On top of that I'm not sure that if my 300 looses a water pump it will even care until it revs past 1200 rpm for a while (depending on the weather) not a walk home situation.
Originally Posted by Red90
If the rad fan stays running the coolant will circulate on its own until the thermostat closes.
Adding more complication makes it less reliable, not more....