Weird... issue/function of blower motor?

[Maverickxeo]

On my 04 Envoy, I've noticed lately (since it's been warm and the A/C is AMAZING) that when I am running the A/C, the blower motor will seem 'loud' and then periodically drop in volume. The force of the air coming out the vents DOES NOT seem to drop off - it just gets quieter. It seems completely random - with no real cause or correlation. It can happen on the highway at a steady speed, when accelerating, when slowing down, or when stopped completely. I notice the volume seems to be very similar between having recirc on or off - but I am not turning off/on the recirc manually.

Is this some sort of weird feature?

 

[TJBaker57]

On my 04 Envoy, I've noticed lately (since it's been warm and the A/C is AMAZING) that when I am running the A/C, the blower motor will seem 'loud' and then periodically drop in volume. The force of the air coming out the vents DOES NOT seem to drop off - it just gets quieter. It seems completely random - with no real cause or correlation. It can happen on the highway at a steady speed, when accelerating, when slowing down, or when stopped completely. I notice the volume seems to be very similar between having recirc on or off - but I am not turning off/on the recirc manually.

Is this some sort of weird feature?

Aircon gurus -- check in

Hell, I'll even take semi-gurus. :laugh: Background: 3 vehicles 0 with working A/C 1 (Sierra) had all seals replaced during my build, and the correct amt / type of PAG oil added (new receiver/drier, and drained oil out of compressor & added new, per specs. Also drained / re-oiled...

gmtnation.com

 

[Maverickxeo]

Aircon gurus -- check in

Hell, I'll even take semi-gurus. :laugh: Background: 3 vehicles 0 with working A/C 1 (Sierra) had all seals replaced during my build, and the correct amt / type of PAG oil added (new receiver/drier, and drained oil out of compressor & added new, per specs. Also drained / re-oiled...

gmtnation.com

Ah, interesting, so it IS a function. Thanks!