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[–] auto_turret 0 points 15 points (+15|-0) ago 

It goes 'wwwrrrrrrRRRRRR' whenever I accelerate while the ac/heat/vent system is running. When I turn it off, noise goes away. The noise pitch is proportional to the engine rpm.

Question is what the hell is going on and am I going to need to sell the farm to fix it?

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[–] WiLiV [S] 0 points 6 points (+6|-0) ago 

Your vehicle has an AC compressor run by the belt drive on the engine. The compressor speed increases proportional to the engine speed. Depending on how severe the noise, I'd say it's your compressor bearings.

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[–] JoeMontana 0 points 4 points (+4|-0) ago 

I hate when that happens.

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[–] QualityShitposter 0 points 6 points (+6|-0) ago 

Sounds like compressor bearings or belt slip. Tighten belt to see if noise goes away. If not, prepare your anus.

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[–] this_beanewusername 0 points 0 points (+0|-0) ago  (edited ago)

Could be the blower motor, especially if it's when the fan is on (and not just the AC). If it's only when the AC is on, I would start checking out the compressor.

The belt runs at a static speed, no matter how fast the engine is going.

When you say "accelerate", do you mean actually "accelerate" (i.e. when vehicle speed is changing)? Say if you're at a steady 60 mph, does it still do this? This would rule out some kind of mechanical issue, like the acceleration of the entire car causing a spinning part to brush up against something (say a radiator fan or blower motor)