AC/Heater makes noise when turned on

Okay here the problem, when I turn my ac/heater on, it usually makes a squeaking noise from the passenger side vents. This only happens when I’m braking or driving around 60+ mph. What is causing the problem? I just want to know, before I take it to get it fix one day.

both vents ? describe the sound you hear a little more?

The sound is coming from the passenger vent near the window. The adjustable vent that you can open and close. It sounds like crickets haha, seriously though, but much the sound is more rapid. Any suggestions?

Your blower motor is located right there, so it could be the bearings in it going bad. That would be my guess anyway.

Later,
BR

alright thanks for ur input.

the blower motor i replace easy and not expensive.

i would say it is the switch or resistor but those have nothing to do with it.

i had a leaf in mine onetime that made that noise.