I replaced idler and tensioner pulley a week ago. The old one doesn't seems to bad. Squealing noise reduced but not gone completely.
Bought tensioner and belt for both ac and accessories.
When I pulled the ac belt I noticed the belt cracked and the pulley was bad (make chattering noise and spins freely). So I decided to just replace both belt and put replace ac pulley with old accessories pulley. That seems to fix it. No more squealing noise.
