Why does a car make an air being released sound when you move the a/c, defroster, heater control thing?
2007-11-18 10:02:10 · 4 answers · asked by carguy 2 in Cars & Transportation ➔ Maintenance & Repairs
Nothing to worry about, it's just the actuator that opens and closes the hot/cold flap inside the heating and ventilation system The actuators work off of a vacuum, and the noise you hear is the air being bled to move them.
2007-11-18 11:26:58 · answer #1 · answered by havetowait 5 · 0⤊ 0⤋
The hot/cold air doors are opened/closed by vacuum actuators. That's a good noise.
2007-11-18 18:16:42 · answer #2 · answered by Bob H 7 · 1⤊ 0⤋
The mechanical mechanism that controls the opening and closing of heat duct output vents is operated by vacuum module. That is why you hear it when you switch from def. to floor or console.
2007-11-18 18:08:58 · answer #3 · answered by seed2ofchuck 2 · 2⤊ 0⤋
not an expert but i think its cos when you change it moves itself an takes lil time so the sound your hearn is just the flap thingy moving
2007-11-18 18:10:42 · answer #4 · answered by Anonymous · 0⤊ 1⤋