All instructions are assuming you are working from the front of the vehicle.
If you do not still have the sticker showing you the belt routing attached to the vehicle take note of the route it takes before beginning. The Pulley is on your left, with a small square hole. Insert your 3/8 in ratchet into this hole, and pull the left (counter clockwise). You should then be able to remove the belt. The pivot point of when you released the tension is the bolt that will remove the tension pulley. Simply remove it, and replace the tension pulley assembly. (The part cost me about $15 at Advance Auto in Florida- I had to call ahead and I had my wife pick it up.)
use a 3/8 drive ratchet to loosen the tension and take your belt off.Then unbolt the center bolt of the tension assembly and replace with a new unit.
It is the small pulley with a nut in the middle on the pulley assembly!
you dont adjust a tension pulley you adjust the position of the compressor to tighten the belt
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Typically, there is one pulley that is mounted on a spring arm to maintain proper belt tension. Just turn the bolt on the idler pulley and the tensioner will release.
You are talking about the tension on your fan belt? If the belt is still on, use your ratchet to insert into the square hole on the tension arm. Use the ratchet as a lever to move the tension are so you can slip the belt off. Then just unscrew the arm, get the new on, screw it in, and replace the belt and you are good to go.
Remove the 4 nuts that are against the pulley behind the fan with the belt still on the truck. Once these nuts are removed, the fan will separate from the pulley. Now you can remove the belt & water pump pulley.
Typically it's the highest pulley, right behind the fan shroud. The tensioner pulley is spring loaded to assure proper belt tension and most tensioners provide a way to easily remove the tension to the belt so that you can replace the belt or belt driven accessories.
Look for the tension pulley. there is a square hole in the end. Stick a 1/2 inch drive ratchet with a short 1/2 inch extension end into it and turn it to releave the pressure off of the pulley.
If it is a serpentine belt you replace the tensioner pulley
if you do not have no experience in fixing car, do not do it
Buy a Chevy!!!! That was a big help. Most but not all serpentine belt systems have a spring loaded tension pulley that just holds constant tension on the belt. If there is a tension pulley, it will be the one pulley that is not attached to anything like the alternator or AC. After that, the alternator is the most likely to be the one that adjusts.