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Weak airflow from HVAC vents

Tiny
MFC6401
  • MEMBER
  • 2004 CHEVROLET VENTURE
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
The airflow from the front vents is weak to the point you basically have to put your hands on the vent to feel anything, no matter if I am using heat or the A/C. The blower has been replaced, the resistor has been replaced, and the cabin air filter has been replaced too. I am at a loss, could it be a blend door? The rear air blows strong as ever.
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Thursday, January 13th, 2022 AT 8:33 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The blend air door actuator is for temperature control. In this case, it sounds like you have an airflow direction problem. That is controlled by what is called a mode door actuator.

I attached a pic below showing the actuator I'm referring to. What I suggest is this. Remove the two bolts holding it to the HVAC box. With the wiring still connected, see if it responds when you select the vents.

Let me know what you find or if you have other questions. Note: The actuator is on the right side of the HVAC box under the passenger side of the dash.

Take care,

Joe

See pic below.
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Thursday, January 13th, 2022 AT 9:02 PM

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