To loosen the bolt, use a socket wrench. You might use the frame for leverage, and you may need some starter or grease on the bolt to give you some give.
socket and force bar on bolt brace against frame and use starter to loosen
14 mm wrench or socket--top bolt does not loosen--take out bottom bolt and snap out pads -- front and back of each wheel
With the bolt facing you, you should turn the bolt anti-clockwise to loosen it. It will be a right hand thread.
I think it is the same as my 98 and you put a wrench on the bolt at the center of the tensioner pulley and push away from the belt.
Loosen the 18mm bolt about 4 or 5 mm and give the bolt a good wack and the pulley should pop. Then remove the bolt and pulley.
loosen the bolt in the center of the drive belt pulley, then loosen the bolt on the side of the pulley. as you loosen the side bolt the tension lets up
Loosen bolt in tension pulley, then loosen tension bolt. Replace belt. Tighten tension bolt. Last, tighten bolt through pulley.
You might have to take the motor mounts bolt and disconnect the exhaust after the Y and at the monifolds and lift the motor slightly to get the starter out.
loosen the serpretine belt tension and remove the two bolt that hold the alternator
The bolt has left-hand threads, and requires a lot of torque. Turn counter-clock-wise to loosen/remove the serpentine belt, then use a cheater-bar on your wrench to loosen the pulley-bolt (turning clock-wise).
Try spraying the bolt with a spray called "liquid wrench" I've used it several times and it works. You may have to spray it several times and let it soak in before the bolt will turn. And...have you tried using a breaker bar, or a cheater bar? There is a risk of breaking the bolt, but it also may just loosen the stubborn bolt.
Loosen lock nut, turn tension bolt.