H3 Alpha AC Fan blowing, no air at vents.

[okcrewed]

Long story short, yesterday the AC was blowing cold, I switched AC off and blower kept blowing out the vents. Then I switched to heat (fan still blowing out the vents) and shut down the engine to go fishing. After I started back up, AC blows cool air but not much volume. Even at high speed fan setting. I can hear the fan roaring, but very little air coming out the vents. Any ideas? I'd like to try something simple before going to the GMC dealer!

 

[Jeepwalker]

The vent/floor issues sounds like the blend door mode actuator behind the glove box door (pass side)...... Pretty simple to change from what I've read (have not changed mine yet). Probably a how-to video....

There are other blend door actuators on the driver's side too you should observe for correct operation (as you change settings) on the driver's side to the Rt of the gas pedal. You can poke your head under and see them. In case you have multiple actuators gone bad. Buy replacements off Amazon or other sites. Let us know which ones were the problems.

 

[rascole]

A recall on the blower resistor harness many years ago. Yours may be original and could be the problem.

 

[650Hawk]

The vent/floor issues sounds like the blend door mode actuator behind the glove box door (pass side)...... Pretty simple to change from what I've read (have not changed mine yet). Probably a how-to video....

There are other blend door actuators on the driver's side too you should observe for correct operation (as you change settings) on the driver's side to the Rt of the gas pedal. You can poke your head under and see them. In case you have multiple actuators gone bad. Buy replacements off Amazon or other sites. Let us know which ones were the problems.

The vent position blend door actuators are the 2 on the driver's side, relatively easy to get to The one on the passenger side is for the recirculate/fresh setting, and I don't believe it is accessible without dash removal.

okcrewed; have you tried the HVAC reset?