94 chevy Silverado blower moter runs but no air flow or very little

SOURCE: fan blower works but no air flow

THE DOORS IN THE HVAC UNIT BREAK ALL THE TIME.

Marvin

• 85242 Answers
• Posted on Dec 24, 2008

SOURCE: Blower motor stays on high, even with key out

the blower motor speed control module is defective, replace it.

SOURCE: air conditioning silverado

The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.

SOURCE: 1999 Chevy silverado 5.3 engine setting codes p171

oxygen sensor failure
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
hope this is a bit of a push in the right direction ...

SOURCE: 2003 chevy avalance a/c blower moter runs with

If you have the automatic climate control and the blower motor won't shut off then you have a failing Blower motor speed control module. Something inside this module goes bad and the result is a blower motor that keeps running at times even though the engine is off and the key is out of the ignition. The module isn't repairable but has to be replaced. I believe it is located behind the passenger side of the dash panel.