My AC/Heater is knocking on my 2010 Ford Mustang. Any ideas what could be causing that?

My AC/Heater is knocking on my 2010 Ford Mustang. Any ideas what could be causing that? - 1

The blower motor sounds like it is going bad. The bearings in the motor are worn. You will want to prepare to replace it.

Thank you!

Does it do it when you move the controls? Not the blower control but the vent controls? If so it's what's called the blend door. It's controlled by a small geared motor that goes bad and makes a sound like someone knocking on the dash with a knuckle.