This sounds like a recirculating air door actuator with stripped gears, listen for a change in sound when you move from recirc to outside air, when on recirc the noise inside the vehicle will be greater than when on outside air. Remove the glove box to look at it I hope this helps. Take care.
SOURCE: i have a BMW 2000 323i that makes a vibrating noise
its the pump it may have a blockage of some sort
SOURCE: Lexus RX300 buzzing behind/under glove box
Sure the culprit is in the HVAC system. The cover under the glove box needes to be removed to look and see theres a relay panel and motors that move the air doors inside the duct work the motors are on the out side and can be diffacult to change so even if your going to hire the work done it might be nice to look first so you'll know if your talking to a person that should do this work for you Quizzing the professional sales person at your local auto parts store you'll find the person that they know that buys the parts that fix these things if he buys lots of this kind of part that shop is likly to have a person that can go right to it and fix it cheap and quicker than someone puzzeling over the repair manuel and trying difference things with your money
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SOURCE: pontiac vibe is making a clicking noise behind the
sounds like a blend door motor making noise to me.
SOURCE: 2008 chevy impala making
This link will help you out. Just copy and paste the link in your browser.
http://www.denlorstools.com/autoblog/2010/08/impala-loud-clicking-noise-in-dash-car-repair-article/
SOURCE: 2005 pontiac vibe just started making like &
you have a bad actuator motor or a broken blend door in the heater box, the noise you hear is the skipping of the gears in the actuator motor, the ehating system along with ac use motors to move doors inside the heater box, the doors control the flow of the air and the temp, you will need to locate the bad one by unplugging one at a time, when noise stops you have the right one, remove it by removing screws that hold it to box. with motor removed look at the hole that controls the door, you will see a small square that the motor turns ,this id part of the door hinge, you should be able to turn side to side, this swings door left and right like a rood door, open or closed, if the door swings good then the actuator is bad, let me get a picture to help you located it, you will located the heater box in the location of the noise, behind glove box, try to acess from the bottom of the dash and also remove glovebox,hope this helps, good day
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I will have to see if it makes a difference today, but I'm pretty sure that it sounds the same whether circ is on or not.
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