There is front serpentine drivebelt that emanates from the front of the engine which is very important to the operations of the engine and its attachments such as the alternator and air conditioning compressor. Owing to its operational role and construction the belt is susceptible to wear and tear and should therefore be checked regularly but in a vehicle's lifetime the belt rarely needs replacement even at 100000 miles. This means stopping the engine and then examining the belt from one end to the other for signs of cracks or the splitting of the plies Turn the engine to move the belt out of the pulleys' circumference to get the best view of the belt surface. I look for signs of fraying and glazing as well as for indications of pulley distortion-nicks, cracks, corrosion, and other signs of wear. With reference to the edges of the belt ribs it is common to find some cracks and these are not necessarily a sign that the belt needs to be replaced unless they are severe, that is if the crack lines extend over the breadth or depth of the belt. For removal, unscrew the right front wheel lug nuts, then follow by lifting the vehicle on jack stands, then finally, remove the right front wheel and lowering splash shield. As a caution, get a look at where the drivebelt is before you remove it from the pulleys. For a V6 engine, use wrench on the tensioner center bolt to loosen the tension and for a four-cylinder turn the handle anti-clockwise using 3/8 inch driver or breaker bar. Place the new drivebelt around the right pulleys so that it would snugly fit the corresponding ribs of the tensioner before the release of the tensioner. Following this, remove the lower splash shield and wheel, lower the vehicle, and my the lug nuts. Regarding tensioner replacement, the drivebelt must be first removed before the tensioner could be detached from the engine with the help of removal of the tensioner bolts, and the installation of the new tensioner involves the reversal of these steps to which additional tensioner bolts must be tightened.