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Re: Whoopie cushon/balloon noise
Try disconnecting the air intake and see what happens (that won't harm the engine). I don't believe it will harm the engine w/ this noise, although it might be a little embarrassing. They have been using corn to make gasoline, I wonder if they started using beans? Let me know the results and any new clues you may think of or the truck may develop. Have someone under the hood when u shut truck off to see it they can figure exactly where it's coming from. Beano in the gas tank? No, No, don't do that. countrycurt0
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This because with the windows closed, you are in a sealed enclosure and you are pulling air from outside and putting the vehicle under pressure. Imagine blowing into a partially inflated balloon without having your lips on the balloon. The pressure restricts the air flow. If you want to keep the windows closed, you should choose the Recirculated Air setting which takes air from INSIDE the car and circles it over the windshield and back into the car.
Check the following:
Fluid level in master cylinder is at correct level - between min and max marks or just below the bottom of the cap. If fluid level is okay then was master cylinder very low on fluid recently? If so it may have air trapped in it. Most master cylinder's these days need to be "bench bled" first.
However, the most likely problem is the seals in the master cylinder are bad. You will have to replace it. Another possible but rare problem could be the rubber section of a brake line is "ballooning" when you step on the brake.
The air noise you hear is most likely vacuum from the brake booster, which is normal.
Hope this helps.
This problem sounds like the aircompressor pully, the bearing is shot.
With the engine running and the air conditioner off there is a grinding noise, look at the compressor pully, does it wobble? Then turn on the air conditioner and the noise stops, look at the compressor pully again, the wobble stops? If so that's the problem.
This could be a combination of things. I'll suggest them and see how you go.
The tyre pressures have the most effect on road noise. Strangely there is more transmitted noise when tyre pressures are correct. Under inflation cuases a cushioning effect, whereas over inflation can make the tyre profile balloon reducing road contact.
Check that they are in limit.
Tyre tread profile can produce a humm if there are straight lateral bars. Good designs use offset bars to reduce this effect.
Cover any loadspace, and ensure sound deadening panels are in place.
Shock absorber top and bottom bushes come in different relilliancies. Hard provide tighter handling - but allow more road noise, soft absorbs noise, but allows more roll.
These bushes harden over time - thus transmitting more noise.
Shock absorber seals can swell enough to make a shock "sticky" - thus transmitting more noise.
Other suspension bushes likewise harden and become more solid with age.
So, - If it is bothering you, Check tyre pressure and condition. Cover loadspace with sound deadening material - A rubber mat in the boot works wonders.
Inspect rear shocks for wear/ corrosion.
Remove and replace bushes with new.
Replace shocks with new if required.
Inspect suspension bushes, & replace if cracked or perished.