There is a safety switch on the fan, that if the fan is on and you close the vent cover, the fan shuts off. Likewise, if the fan switch is turned on and you open the vent cover, the fan will start running. The safety switch is to protect the fan motor from damage of over heating. For piece of mind just use the on/off fan switch to control it.
Bob
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2013 Ford F250 SD 6.7L
2014 Wildwood Heritage Glen 282RK
Certified Rumble Strip Tester
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