It may be it turns off when the air temp coming out drops to a certain temperature, but, turns back on when the residual heat in the exchanger heats the air above the point it is set to turn on. In other words, your heater turns off, then the fan turns off, then the fan turns on once again to cool the heater down. Just an opinion, I know some home heaters will operate like this.
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2011 Toyota Tundra double cab
2015 27RLS
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