quote:
In my thinking (which differs from others) with the horizontal baffle, the lower switch on the inlet is not needed. Trying to match the inlet switch setting to the thermostat does not make a stable control loop.
My (unstudied) opinion on this is that they did less scientific diagnosis. They just figured if the coolant exiting the radiator was hotter than 157, then they needed more blowage, therefore the second fan kicked on.