Located in front of the engine are the drivebelts, and they should be in good condition and properly adjusted to ensure that the engine is running well. The belts tend to stretch and wear out over time, so it is necessary to check their condition regularly. Inspect each belt for separation of the adhesive rubber, core separation, severed core, separation of ribs, fractured or seperated ribs, torn or worn-out ribs and cracks on the inner ridges of the ribs using a flashlight when you open your hood. Also examine both sides for fraying and glazing. In case any of these conditions are present, replace such a belt at once. On 1999 through 2005 four-cylinder engines you can check each belt's tension by pushing on it half way between pulleys. The belt will deflect approximately one-fourth inch. To tension an alternator belt loosen its lower mounting bolt and upper tension bolts then pry on alternator housing while tightening bolts. For power steering pump and air conditioning compressor belts-loosen lock bolt on tensioner assembly and set tension with adjusting bolt then tighten lock bolt. When replacing any belt(s), follow adjustment procedures to remove any interfering components and release tension on the belt(s). Take old belts to parts store for comparison purposes as you select appropriate size new ones for pulley grooves. If both belts are worn out it is advisable to replace them at the same time. On 1999 through 2005 four-cylinder engines adjust belt(s) as specified earlier herein above. To install a new tensioner just reverse what was done during uninstallation starting by removing drivebelt first followed by taking off tensioner together with its mounting bolt(s).