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Q:

alternator belt diagram...or serpentine belt. this has a separate belt for a/c on 1990 Chrysler New Yorker

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the a/c belt is a v belt. the alt or serpentine is grooved the is a tensioner pulley but no idler pulley
(1) Answer
Google image or look around under the hood near the radiator for a diagram, maybe youtube. There is no idler pulley for this belt!!