Located at the front of the engine, these drivebelts should be in good condition and properly adjusted for an ideal engine performance. With time, drivebelts stretch and deteriorate hence they have to be checked regularly. On 2007 and earlier four-cylinder models, one belt drives the alternator and water pump while another belt drives power steering and air conditioning. For 2010 and later four-cylinder models, 2.7L, 3.3L, and 2010 and newer 3.SL V6 engines only one belt runs all the accessories. To check each belt's tension push on it (about halfway between pulleys), it should deflect about a quarter inch as the best check point. It is required to loosen the lower alternator mounting bolt; upper tension bolts are loose enough for adjustment of this belt; on other hand lock bolt must be undone from the assembly so that belts for power steering pump as well as air conditioning compressor can be adjusted too. The right degree of tightness in belts may be achieved by screwing or unscrewing of their adjuster bolts. Before changing belts ensure that anything preventing access is removed such as brackets or engine covers among others. Bring along your old belts to compare them with new ones at spare parts shop before you fit them in place for accurate positioning in grooves of ribbed pulleys after that redirect a few recommendations below: however for removing a crankshaft pulley (in order that it can then be slipped off). Both should be renewed simultaneously if such happened to any system part including itself because replacing two units costs less than changing them separately; don't forget adjusting according to previous instructions which apply as well afterwards; finally any maximal elongation means springing forth anew from its shaft thereby needing entire disassembly of this accessory device until obtaining another complete kit whereas there exists local parts store where defective unit shall simply get replaced by another new. To replace a belt it must be slipped off the crankshaft pulley and removed; both belts should be changed at once. The earlier methods of adjustment with the belts are still applicable. A new one should be used if the belt has stretched beyond its maximum length. Loosening the right front wheel lug nuts, raising and supporting the vehicle on jack stands, and removing the fender splash shield are necessary to replace drivebelt tensioner. The drivebelt along with either drivebelt tensioner bolt or assembly bolts should be taken off before proceeding installing a new tensioner that is further tightened into place as follows.