Heater isn't blowing hot air

What is your question?

All of a sudden my 2016 Acura MDX heater is not blowing hot air. Everything works fine, except the air coming out of the vents isn't a warm as it used to be. And since its -30 Celsius here in Winnipeg - I need the heater to work perfectly. Thank you

What makes this problem better or worse?

Nothing makes it better or worse

How long has your 2016 Acura MDX had this problem?

3 days