No adjustment it has a tension pulley how old is the belt may just be time for a new one. Or the spring on the tensioner could be getting weak. Replaced my belt and kept the old one for a spare.
John & Carol
01 31'Sea View single slide, F53 V-10
96 Toyota 4-Runner auto 4x4 (Remco, M&G brake system)
That squealing may be indicative of a failing Bearing on the tension pulley, the Alternator, water Pump,AC Compressor or Power steering Pump. Get it checked!
On my 1999 v-10 , the bearing in the tensioner started to fail and squealed once I got to about 55 mph. Replaced the tensioner and that took care of it.
It is very possible at 11 years old the belt is dry and noisy. You can try shooting a little silicone spray lube at the belt and see if it quiets it down. The effect won't be permanent, it will only last a few days at most, but it will rule out bearing noise. If the noise goes away with a little shot of silicone, replace the belt. I recommend Goodyear Gatorback belts for engines which have problem with belt noise.
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