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WIERD NOISE


dohc v6

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THIS IS DIFFERENT FROM THE OTHER NOISE. BUT WHEN YOU TURN ON THE CAR IT SOUNDS LIKE SOMETHING COMES ON AND IT SHIFTS A LINE AND MAKE A NOISE LIKE IT IS HITTING SOMETHING. IT ONLY DOES IT WHEN YOU START THE CAR. ALSO MY BROTHER 93 GRAND AM GT MAKES THE SIMILAR NOISE AND IT LOOKS LIKE HIS AC LINES DOES SOMETHING

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My '92 Lumina makes a similar noise. It sounds like it's coming from under the dash board on the passenger side.

 

In my case, it's the heater box door(s) opening/closing. Why, I have no idea. I don't recall this sound always being there either, so why it started is anyone guess.

 

I figure I'm losing vacuum someplace when the car is shut off and parked.

 

This might explain why on extremely rare occasions the A/C will stop blowing through the dash registers and blow through the floor vents.

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