I couldn't figure out what was causing the squeal, so I just started swapping out parts. First I tried to remove the old tensioner, but the socket slipped and smoothed out all the faces on the bolt. I then tried needle-nose vice-grips, those didn't work either, so I just swapped the new idler pulley onto the old tensioner. Still squeaked!
I swapped out the idler pulley on top with an AC Delco one. That didn't work either!
I finally swapped out the old belt with a new one and BINGO, noise gone!!! I should've just swapped the belt out first, DUH! AC Delco recommends replacing the idlers when you replace the belt, so I'm all set for the next 100,000 miles ... yeah right! I'll be happy just to make it another 24,000 so I can break 200,000. Then it'll be time to drop in a V8!
Look at all those cracks! I wonder if it's the original?
The new belt barely fit. The tensioner was already bottomed out, so I had to push down really hard on the belt. You can see the line on the tensioner arm is just outside the acceptable tension band (the rectangle just below and to the left of the bolt). It should move left as the belt breaks in.
The flange on the Water Pump is thinner than the original so the bolts stick out. Good for using the fan removal tool! On the old one, you had to take the pulley off, put the bolts back on the flange and use the removal tool on that.
If you don't happen to have a new thin-flanged water pump to reinstall your pulley onto, you'll have to do it the old-fashioned way and put the pulley loose on the fan clutch, mount the clutch, put the bolts on the flange, tighten the clutch to the flange using the special tool, take the bolts off, put the pulley on and somehow get the bolts back into the holes.
TIP: Use a 1/4" drive metric deep socket by itself as a nut driver to start the bolts. (I didn't have one of these when I was taking them off earlier). Tighten with 1/4" socket wrench and shallow socket. Anything larger won't fit.