There should be an auto tension device. It is not adjustable. Usually at 60k miles you replace the serpentine belt, and usually you'll want to replace the tensioner as well. If tension is a problem, make sure it's the right belt, and if so - replace the tensioner.
2000/2001 BELT TENSIONER
There is a simple fix to this issue and I've run across the answer on a message board about a year ago, and when implemented by the Toyota mechanics there were amazed that the issue was fixed in less than a minute when their consideration was to purchase a new belt tensioner assembly at $350 bucks for the entire assembly.
NOW, you going to hate me for this but I cannot remember what the fix was. It had something to do with either tightening the Tensioner Pulley, or Tensioner Bold or some adjustment to hydraulic cylinder or flange. I'm sorry for the loss of memory, I should have wrote it down, cause the fix lasted 1.5 years and I have 120K on my Celica.
NOW if anyone knows what the funk I'm talking about, please fill me in, because the squeak is back and they are offering the same solution to purchase the assembly kit.
Alright. I just changed the Serpentine belt on my wife's 2001 Celica GT. Here are fairly detailed instructions on how to do it. USE THEM AT YOUR OWN RISK!!! USE THEM AT YOUR OWN RISK!!!
First. There are six pulleys on the passenger side of the motor. They are arranged almost like the diamonds (or whatever) on a 6 of diamonds playing card with the two in the center being set closer together than the top and bottom pairs. SO get a piece of paper and draw six circles on it like this. I am going to use numbers to help explain how the belt is routed.
2) alternator (1 power steering
tensioner pulley 3) (4 water pump
crank (5 6) A/C
The parenthesees show which direction the belt goes around the pulley.
Second, Take off the right side plastic cowling by popping out four plastic studs. Use a flat blade screwdriver and carefully pry them out. You may even be able to reach under and push a locking pin out of them. It is the dot in the center of the button head. Just push it straight out.
Third, Take off the top cowl from the head. It has two 10mm cap nuts and two plastic studs. They are not the same as the passenger side cowl studs. Just carefully pry them out with a plastic screwdriver. You will damage the cowling less if you pry under the cowl, not the buttons.
Fourth, Use an 18mm box wrench to loosen the bolt that holds the tensioner(About 6 inches behind the tensioner pulley). Push on the belt and you will notice that it has loosened some. Use the handle of a hammer to push harder on it and it will loosen a little more. Pry the belt off the alternator pulley and the rest will be pretty easy.
Fifth, Start routing the belt around the back three pulleys. Get it under pulleys 5(crank pulley) and 6(air conditioner compressor) with the ribs facing up. Loop it so that the flat side of the belt goes around pulley 3(Tensioner pulley). Then snake it around pulley 1(power steering) with the ribs facing the pulley. Move to the front of the motor. Bring the belt up and around pulley 4(Water pump)Bring up all remaining slack to the alternator pulley (6) Now holding the belt with one hand, make sure the belt has not fallen off the pulleys and adjust as neccesary.
Now take a 19MM box wrench and put it on the adjuster lug(about two inches forward of the bolt you loosened) on the tensioner assembly and pull toward the front of the car. At the same time, wiggle and pull and tug the belt onto the alternator pulley. You may need to put the box end of your 18mm wrench over the front lug of the open end of the 19mm to extend the 19mm so that you have leverage to pull it forward. Once the belt is on the alternator pulley, let the 19mm wrench back off. it will feel spring loaded. The belt will tighten and snug itself down to the pulleys. Then just tighten the 18mm bolt back up and check your work. Start the car to make sure it is on properly. Replace your cowls.
In the last post, the parentheses are wrong around the 1 and the 2. This is correct. (1 2), 3) (4 , (5 6) Sorry, Chris.
If it is a drive belt and not a serpentine belt is has no tensioner. You manually adjust the tension by normally adjusting tension by moving the alternator. Loosen to bolts holding the alternator in place and then adjust the tension. Tighten the bolts when the tension is right. If it is serpentine belt if you follow the belt around the the engine you will see the tensioner.
If it is a serpentine belt, the tension is automatically adjusted by the tension idler. If the belt is loose then the tensioner needs replacing. If it is a normal drive belt, then the alternator is mounted on a slotted bracket that allows you to adjust the position of the alternator. You can loosen the bolts and adjust the tension on the belt.
The belt tension should adjust automatically. There's a thing called a belt tensioner that has a strong spring in it (you can't see the spring) that keeps pressure applied to the belt. This belt tensioner is what makes the serpentine belt so hard to remove. Many times the tensioner is in a difficult place access.
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