What's this switch for?

[jbcollier]

I have the pump in the rad inlet hose.  It will negatively affect the flow through the heater core but that's not an issue as it never comes on at temps when I need heat.

[GavinT]

Thanks, John.

Are you using the Davies Craig digital controller?
If so, could you comment on the location you chose.

I note Davies Craig say to install the sensor in the thermostat housing or an in-line adaptor . . which presumably means downstream of the thermostat in our cars.

[jbcollier]

The EWP is controlled by the rad fan switch.  It only runs when I am sitting idling in traffic on a hot day.

[andy harwood]

I used the D/C pump & controller in my TCS. Pump placement was beside the radiator, sensor placed in the thermostat housing. Worked.  Pump ran a couple minutes after shutting engine down.

[GavinT]

Many thanks John & Andy.
Too easy . .