Hi,
In the last few days, the fan has been acting oddly. I sometimes hear a loud hum and the air barely blows. When I start to take off, it blows normally for a few seconds and then stops again. The hum made me think the motor was having issues but then it blows okay for a little while. Could someone offer some advice on where to start?

 

Cabin air filter, see if any obstructions are present around the fan.