You have to pull the radiator to get the alternator out. had to do this couple months ago. then after you get it unbolted you need to slide it past exhaust and out toward the drivers side of car. pulling radiator was rediculous, but the only way!!!! hope that helps
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Verbal description of the complete serpentine belt loop on a 99 Olds 3.5 V6: This is from Benny 1345 (Answers.com) - off the top of my head it sounds right: Top of CAM to top of ALTERNATOR - bottom of ALTERNATOR to top of nearby (front) PULLEY - bottom of PULLEY to top of A/C COMPRESSOR - bottom of COMPRESSOR to bottom of CRANK - top of CRANK to bottom of middle PULLEY - top of middle PULLEY to bottom of rear TENSIONER - top of TENSIONER to back to top of CAM. Remember the serpentine belt has ribs on only one side, the ribs face AWAY from the two guide pulleys and TOWARD the pulleys on the Alternator, Compressor, Crank, Cam and Tensioner. You should tell by the pulley being smooth or ribbed as needed.
disconnect the + lead of the battery Remove the wires going to the alternator. Mark them with a piece of tape so you can put them back to the same terminal. there are probably two bolts that need to be removed. One will be fastened to a slotted strap. Removing this one will allow the alternator to pivot on the remaining bolt. This will be the one that allows the fan belt to be removed from the pulley on the alternator. Removing the 2nd will allow the alternator to be removed from the engine. Installation of the replacement is the reverse procedure. Aftere you install the 2nd bolt, put the fan belt back in the slot and pull the alternator so the slack is taken up in the belt, then tighten the bolt