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check tyre pressures are even. tyre tread pattern will cause noise that increase with noise (off road pattern are noisy while highway pattern will be quite) Have the wheel bearings check for condition.
With the belt off, try to spin each pulley that spins and see if there is any roughness or flat spots on the bearings that you can detect with your hands.
Usually, the bearings on Alternators or idler pulleys go bad before the a/c because the a/c should have oil in it. However, it could be any of the pulleys that the belt spins on.
It can be a process of elimination of changing parts until the sound goes away, if you can't detect it under free spinning conditions with the belt off.
The radiator fan(s) must come on immediately when the AC is turned on. Blow out the radiator core from the engine side with compressed air to get rid of bugs and other debris. Make sure the radiator cap seal is in good condition (check when cold). Is the engine hot enough to force coolant out of the radiator? Hope some of this helps!
It's not normal, it sounds like the throwout bearing may be making the noise. It's hard to say how long it will hold up. I've seen them make noise for a while. I would check the fluid level in the clutch master cylinder.
If the engine isn´t making any abnormal mechanical noises, then I would expect the oil pressure sending unit at fault.
If however the engine does make more or abnormal mechanical noises, it could be a too low oil pressure and this should be addressed immediately.
Try removing the belt and turning each pulley by hand. If everything is smooth and free, with the belt still off, drive down the block once and see if the noise is there (this will eliminate all rotating accessories on the front). If you hear the noise, then there is a problem deeper inside. Oil pressure is good? Dont' forget when doing this, you will have no power steering, so be careful.
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