[Gooserider]

Rocketmanx; I think you have a confusion about what 'pump heat' is about... Pump heat doesn't have anything directly to do with the heat put out by the pump motor, indeed for many pumps there will be very little heat transferred from the motor to the pumped fluid. Pump heat is the heat generated in the fluid by the friction of making the fluid move, friction between the fluid and the pipes it flows through, etc. Much of what is labled 'pump heat' doesn't actually originate in the pump itself, but rather gets generated by the flow through the system.

Thus cooling the pump motor might get rid of an additional heat source in your case, but won't have direct impact on coolant temp. (unless you use the same loop, in which case you'll raise the temp by whatever you pick up from the pump motor that would have otherwise been dissipated in the air.)

Cooling the pump head with the same loop will have no major effect other than to possibly raise the temps by a small amount due to the extra friction of the added lines. Cooling the head with a different loop might lower the temps, but only by the same amount that adding that much cooling anywhere else in the loop would.

In short, there is no magic advantage to be gained by cooling the pump.

Gooserider