2019 tundra heater blow cold air

I check my heater hose, it’s working, the thermostat is working. Could it be the climate heater control not working?

thanks.

 

Probably an actuary flapper is stuck open or broken. Either way have to replace the whole unit. Which means dash has to come out. I did this few years ago. Was only getting hot air on passenger side ya. It sucks. In photo is what it looks like the HVAC unit.

 

Check your coolant level, is it low? My old Frontier would blow cold if the coolant level was low.

 

Please try the simple reset. With the insane multitude of electronics could be something that simple. It's the fix for the Lexus RX and NX and for the Highlander and Rav4's. Just undue 12v battery ground cable for couple minutes and reconnect. Worth a try.

 

I believe there is a blend door recalibration that can be done through Techstream.