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Note - procedures based on 1997 to 2003 model year engine. Some details may differ for 2004 to 2010 model years.
• The belt tensioner is located towards the passenger side of the engine just above the AC compressor.
• Remove the belt from the engine. If you're replacing the tensioner because it is stripped, you may remove the belt by cutting it off (cautiously).
• Remove the (3) bolts that secure the belt tensioner to the engine block with a 10 mm socket.
• Install the new tensioner in reverse order. Use a liberal amount of anti-size on the bolt threads. Do not over-torque the bolts, the engine block is aluminum and easy to strip.
• A common problem with the tensioner is that, even though it accepts any 1/2" square drive, is that some people will use a breaker bar or ratchet with a long extension. The spring loaded detent ball in these tools makes it difficult to fully insert the male square drive into the tensioner. Once pressure is applied, the square drive slips due to poor fitment, shredding the soft aluminum tensioner.
A belt tensioner tool, which is designed specifically for these applications, is inexpensive, more convenient, and more effective for these procedures.
• Reinstall the belt, rotating the tensioner tool clockwise to loosen the tensioner and releasing counter-clockwise to allow it to secure the belt. Follow the belt routing procedures posted for your specific engine on the underhood diagram.