Quote:
Originally Posted by Daox
You're running the Davies Craig controller, right? According to their site, that runs the pump (albeit slowly) continuously, at anything more than 23° F (-5° C). Below that it is pulsed at an oddly low rate.
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Your not reading that quite right. It pulses the pump on/off/on/off, etc until it gets to within 5deg C of the set point (this would be your thermostat point). 10 on, 10 off. Then it ramps up. When I am doing something like cruising down the freeway I can watch my temp readout fluctuate about 5-7deg as the pump turns itself on/off. In low load higher speed (75mph on the freeway) the cooling system is working so good that you don't want the pump running all the time because then the motor would be too cold.
I'm betting you would find that in a more OEM type cooling system, especially one where the grill is blocked off, the pump will probably run almost all the time.