I have a 2017 Hyundai sonata se. The fan control **** is not working correctly. When I turn it from off to all the other speeds it does not come on. But I discovered that if I push in on the ****, sometimes the fan will come on on all the speeds. Any ideas? Do I just need to replace the **** or something else. And if so, how do I go about doing it. I can't find a tutorial online that shows me. Thank you...

This is the unit I'm talking about.