This is an easy job. There is a small spring-loaded idler pulley that maintains the proper tension on the belt. To remove the belt, you must first relieve tension on this pulley. Do this by inserting a � drive ratchet or breaker bar into the center of the idler pulley and apply enough pressure to slip the belt off. Before removing, pay close attention to how the belt snakes around all the pulleys. There should be a diagram in the engine compartment, near the hood latch. If not, sketch it before removing the belt. Reinstall the belt in accordance with the diagram. It is easier if you do the idler pulley last.
See related question and answer at: http://www.wikifaqs.com/Q/How do you fix a 1998 Grand Marquis serpentine belt
diagram for 2003 grand marquis belt installation
You can't, the serpentine belt (or fan belt) on a grand marquis is equiped with a self tensioner, if your belt is making noise it either needs to be replaced or one of the pulleys on the cars may be loose and would need to be replaced.
The 1998 Camry did not have a serpentine belt. Do you have a 1998 Corolla?
Had that problem in my 1996, solved by replacing the serpentine belt and belt tensioner
How do you route the serpentine belt for a 1998 w
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The belt tensioner is rotated clock wise with a 15 mm wrench or belt tool.
Engine used a serpentine belt, with a spring-loaded tensioner. You cannot tighten the belt. If the belt is slipping, either one of the driven components is going bad and dragging the belt, or the tensioner is bad.
Away from the serpentine belt
diagram of serpentine belt for 528i BMW