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Old 12-10-2009, 09:49 AM   #11 (permalink)
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Quote:
Originally Posted by Christ View Post
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.
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Originally Posted by Old Tele man View Post
(servo-mechanical flow control or electric pump control)
...one "or" the other, not both!

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Old 12-10-2009, 11:48 AM   #12 (permalink)
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Quote:
Originally Posted by Christ View Post
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

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