Efficiency increase with a warmer engine? (195F vs 165F)

[Old Tele man]

Originally Posted by Christ

If the electric water pump is ECU controlled, why would you need a t-stat at all?

I mean, the ECU could just shut off the pump and monitor temps until the pump needed to move the hot coolant.

Originally Posted by Old Tele man

(servo-mechanical flow control or electric pump control)

...one "or" the other, not both!

[DonR]

Originally Posted by Christ

If the electric water pump is ECU controlled, why would you need a t-stat at all?

I mean, the ECU could just shut off the pump and monitor temps until the pump needed to move the hot coolant.

Heater circuit. Most thermostats/housings have a bypass to allow coolant to circulate through the intake manifold, if applicable, and the heater core. Without a pump always pumping this either wouldn't happen or would circulate very slowly. I suppose a second small pump could be used for this.

Don