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top and bottom will be tight but you need to check the chain guides and the chain tensioner. To properly inspect you may have to remove an inspection hole in the cover or remove the timing cover altogether
Park the Pontiac in a safe work area and open the hood.
Inspect the top of the black plastic cover that surrounds the fan for the serpentine belt routing diagram. This diagram has the instructions for installing the new serpentine belt around the accessory pulleys.
Inspect the front of the engine and locate the automatic belt tensioner. The tensioner on the 1999 Pontiac model vehicles is located between the alternator and the crankshaft pulley. The tensioner has a pulley on one end with a bolt head in the center of the pulley. Use the bolt head to rotate the tensioner.
Turn the tensioner counterclockwise with the breaker bar and a metric socket. Pull the belt out from under the tensioner pulley with your other hand. Then, slowly let the tensioner retract until it stops.
Pull the belt out of the other remaining pulleys. Then, pull the belt out of the enginebay and lay it on the ground.
Route the new belt around the crankshaft pulley. Then, route the new belt around the other remaining pullleys by using the serpentine belt routing diagram for instructions.
Rotate the tensioner pulley counterclockwise with the breaker bar and socket. Then, slide the new belt under the tensioner pulley. Slowly let the tensioner retract until it stops. The tensioner pulls all of the slack out of the belt and brings the new belt to the proper tension. Remove the breaker bar and socket from the tensioner pulley.
Inspect the new belt to ensure that it is seated inside of all the accessory pulleys as directed by the diagram. Then, crank the engine and allow it to run for about 15 seconds. Turn the engine off. Inspect the belt again once more to ensure that
the belt is still around each pulley. Close the hood.
Normally this is a simple job. You have a spring loaded idler that holds tension on the belt. You put a 3/4 breaker bar in the square hole and lif up and slip the old belt out, taking care to note the threading path of the old belt. It is usually pictorially found on a decal on the radiator near the idler. You thread the belt around the pictured accessories leaving the idler last, pick up on the idler and slip the belt under.
You'll have to remove the engine cover under the bottom so you can position the new belt on the pulleys properly. Get a wrench or tensioner tool and turn the tensioner clockwise to relax the drive belt. Don't apply excessive force.
It's hard to draw a picture with words, but looking at the engine from the passenger side of the car, there are basically two top pulleys, two middle, and two bottom. The drive belt goes around the outside of the two top and two bottom, and on the inside of the two middle.
Take the fitting loose and check for damaged threads in case it's a cross threading issue. I would suggest screwing the fitting in by hand to insure threads are properly engaged, on any situation.
If the threads are damaged you might have to rework them by "tracing" with a die on the male portion, or "tapping" the female portion.
If they're not damaged, try to screw the fitting by hand as far as you can, then tighten with a wrench.
You might also try teflon plumbers tape if needed.
Sometimes a simple thing can become such a pain... Good luck!
Look the fan shroud or radiator cover for a picture of the belt diagram;
If not there, you can thread the belt behind the fan then you can
thread it over a blade and turn the fan, thus not having to remove the
fan. Once the fan issue is resolved or not an issue and you cannot find
the threading picture, then you can use your common sense to figure
that the belt must be driven by the crankshaft and look at the ridges
on the belt to decide which side of the next pulley that needs power
and continue this process over and around each auxilary unit until you are sure of
the threading then put your 1/2 drive ratchet into the tensioner and
move (raise or lower) it asside making sure that all the little ridges are in place on
the ridged pulleys then release the tensioner. That should do it. good luck
well i was going to scan and sent the picture here but printer wont work the tensionor is the last end of the belt you want to do. you will have to jack it up and remove the splash gaurd only 3 screw to have excess to the belt. once you are ready run the belt under the harmonic blancer going to your right go on top smog punp and around air conditioner pully go under idler pully and up and over the alternator pully down and around power steering pump and up to tensioner. now get a 156 millimeter sock or wrenc and pull down on tensioner and put belt on it done if you need to auto zone can print you a diagram out for free