1. Park the vehicle on a level surface, apply the parking brake, and turn off the engine. Allow it to cool down if it has been running.
2. Locate the serpentine belt (also known as the alternator belt) on the front of the engine. The alternator is usually located on the passenger side of the engine, near the top.
3. Loosen the serpentine belt tensioner pulley. This can usually be done by using a wrench to turn the tensioner pulley adjustment bolt counterclockwise. The tensioner pulley is usually located near the bottom of the engine, below the alternator.
4. Remove the serpentine belt by slipping it off the pulleys. Make note of how the belt is routed around the pulleys, as you will need to install the new belt in the same way.
5. Inspect the old serpentine belt for signs of wear or damage, such as cracks, fraying, or glazing. If the belt is damaged, it should be replaced.
6. Install the new serpentine belt by routing it around the pulleys in the same way as the old belt.
7. Tighten the serpentine belt tensioner pulley until the belt has the proper tension. The belt should be snug but not too tight. There should be about 1/2 to 1 inch (1.3 to 2.5 cm) of deflection when you press on the belt with your thumb.
8. Check the alignment of the serpentine belt to ensure that it is tracking properly on all the pulleys.
9. Start the engine and let it run for a few minutes. Check for any unusual noises or vibrations. Turn the steering wheel from lock to lock to check that the belt does not slip.
If everything looks and sounds okay, you have successfully replaced the alternator belt on your 1990 Honda Accord.
