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Must be disconnected
Jim,
The Aux fan will come on in either of the two following conditions:
1) The sensor mounted inthe radiator core reaches the set point of your thermostatic controller. I suspect it is still set at the 210 point and your coolant (as you noted) has never gotten there.
2) Any time the computer turns on the main engine fan, you should also have the Aux Fan running. It is here that I think something is not right. The "break-in" harness picks off the low speed fan drive signal and (when hooked up to a stock OEM installation) will also come on when high speed is commanded by the computer.
I suspect that the installers left out the heavy duty 3 pin "break-in" harness that went to the OEM fan when they rewired to accept your new fan set.
Do you have a schematic of their installed system yet?
Regards,
Mike
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