2008 Malibu w/ clicking A/C & Heat.

[iMattSimpson]

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!!!

[GMCustomerService]

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

[gmtech1]

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.

[thusted]

could the brake be pulling vacuum away from actuator?

todd

[gmtech1]

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