Your 1998 Avalon most certainly came with a serpentine style (multi-ribbed) belt for the a/c and alternator drive, and a second one for the power steering! The Gates part number for the alt/ac is K060407, and for the ps is K040347. Timing belt is another (unrelated to your serp belts) part, and is being recommended as a preventative maintenance item. A broken timing belt will leave you stranded, but will not destroy the valves & pistons like some engines do when they break a timing belt. If you decide to have the timing belt done, do the water pump, too. Saves the time of getting in there twice down the road!
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