2008 Malibu w/ clicking A/C & Heat.

Since it's starting to get nicer outside I thought I was tackle some of these car issues I've been having.

When I turn on my A/C or Heat I have a constant clicking noise coming from what sounds like behind the glove box area.

When I turn off the A/C or Heat of course the sound stops.

When I hit my brakes the click gets more prominent until I come to a complete stop.

When I turn the A/C or Heat up the sound goes away. It may just be the sound is muffled out but I can't tell.

And lastly, my air directional knob isn't working properly. For example when I set the air to blow on my front window, it still comes out of the upper body area vents.

Any help would be appreciated. Thanks!!!

Good morning iMattSimpson!

I realize you're probably seeking out some how-to advice. However, if you do decide to work with a dealership on getting your HVAC looked into, please be sure to let me know in a PM here on the forum as I would love to be available to assist in whatever way I can.

All the best,
Sarah
GM Customer Service

Sounds like the hvac mode door actuator gear is stripped/broken. That would cause the noise and the modes not changing. Not sure why it would change when braking though.

could the brake be pulling vacuum away from actuator?

todd

No, the mode door actuator is electric, no vacuum to it.