IIRC, you loosen the adjusting/idler pulley for the alternator and then between the radiator and the alt bracket you unscrew the adjusting bolts as far as you need it, don't let it drop out though. Then you need to loosen the power steering bracket. That system is so frustrating, that I took out the 90 and alternator and stuck in a 65 amp with no AC and the star adjusting alternator You will have to loosen many bolts to replace that belt. Oh, is there also an adjusting bolt under the wires that connect into the AC compressor? Argh!