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OP - its very likely that the belt is always slipping to some extent due to contamination. If for some reason it has oil, water, coolant, grease, silicon or any of that on it, it will slip enough to squeal. Likely when you turn the wheel the LOAD shoot up so high that slips even more which heats the belt giving it grip on the pulleys.
In the past belt dressing was used as it would clean the belt getting the contamination off it. Basically liquid abrasive. Do keep in mind that a weak tensioner spring could be the cause also as well as highly glazed belt.
As for the source of air - on the suction side of the pump a leak close to the pump could allow it to suck air. These vane pumps do not like to run out of fluid. Once they suck air it damages the rotor and vains which then induce air due to cavitation. Like a boat prop half in the water.
When the system is low the worst thing to do is turn the wheel quickly from lock to lock as it starves the pump inducing cavitation, which foams the fluid, raises the temp and cause more pump destruction. Keep it topped off until the leak is fixed.
2006 Mazda 6s GS Hatchback, Lapis Blue | AJ 3.0 & AW6A-EL 6 Spd, >119,000
V6 repair info here:
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