The fan is not thermostatically controlled. It is just a simple exhaust fan, no more. Its function is to remove the heat created by the refrig itself while the refrig is operating.
It seems counter-intuitive, but the refrig uses heat to generate cold. There are three sources of heat - an AC heater, a DC heater, and a propane flame - and you get to choose which you want to use at any given time. Regardless of which source you choose, the purpose of the fan is to remove the waste heat from the process. The fan should be used whenever the refrig is on (regardless of heat source) and the TM is closed. It is also a good thing to turn it on when the TM is open, especially if the outside temperature is high. In other words, there is no wrong time use the fan.
If you are boondocking, conserving every spec of electricity, and the TM is set up and the refrig is running on propane, you can turn the fan off, but expect some compromise in the refrig's ability to generate cold.
Bill
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