This might be dumb but I had my car making a noise that I would describe as a "whaaaa" sound and it ended up being my fan clutch pulley giving out allowing the fan to hit the pulleys on the driver side. Check your fan clutch clearance to your pulleys and see if there is any play. It would only happen when I stepped on it causing the fan to flex back just enough, and with bearing giving out, allowed it to rub.