Mine comes on just about every ride here in California. I can hear them on after I shut down. I make sure I keep my key on after I kill the engine. I believe the fans turn off when the key is turned off. Anyway, you should see and hear them and they should be on if you are reaching 4 bars.
I'm sure some of the experts will give you some instructions for evaluating their functionality.
Good luck!
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2015 RX-3 Cyclone (Orange)
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