Did you mean Grand Am? At any rate, the engine mount does have to be removed to change the belt. My advice would be to get a service repair manual. It will describe hoe to do most repairs with step by step details and pictures.
The tensior pully can be relieved by putting a socket or wrench on the pully bolt and pulling back one way of they other until the belt comes loose.1998 Pontiac Trans Am GT 2.4L Twin Cam Engine Serpentine Belt Replacement?
ok might find a how to do it by typing into search box
how to replace serpentine belt 1998 Pontiac Trans Am
really not that hard you can also find how to info with autozone website you can find most car repair info just by typing how to replace name of part you wnat a video add that to end of it like
how to replace Serpentine Belt 1998 Pontiac Trans Am video
also can find repair manual same way type
repair manual 1998 Pontiac Trans Am PDF
