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That’s exactly what I was wondering about! I’ve heard some GM’s come with them from factory, but with the weather we’ve been having the heater would never kick out!

I’m wondering if the 2021 F-150’s block heaters only close the circuit below a certain temperature? It doesn’t matter much as I usually don’t plug in until -15°C, but my coworkers have been talking about other brands that use a thermostat to activate the heater.