My hvac system doesn't blow air. I changed the heater control module( control ***** in cab) and they work fine. All settings work and I inspected while going through the settings and all the arms move fluently. I don't understand why air only trickles out if the vents? Someone told me the blower might be to blame but before I rip that monster out I figure i'd check with the experts first

 

Well yeah, first things first, make sure the blower motor is running. You should be able to hear it very clearly under the hood, engine off, key on, heat on high.

 

The blower is def running but the air is still trickling out. There's no umph behind the air. It won't even lift up a dollar bill!

 

In that case it looks like you're stuck removing the air box to clean it out. There can be an accumulation of dirt, leaves, or other debris covering the face of the heater core and preventing air flow.