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You won't be able to get the belt on.
The easiest way to loosen the tensioner is to use an automatic belt tensioner. This can be used on a serpentine belt which is connected to every pulley on the engine.belt.
You will need to loosen the serpentine belt tensioner pulley on your 2002 Chevrolet Avalanche. Slide the belt tensioner to the right. The serpentine belt will become loose and can be removed. Reverse the process to install the new serpentine belt.
Loosen the tensioner pulley. Pushed the tensioner pulley to the left. The serpentine belt will come loose. Remove the belt. Reverse the process to install the new serpentine belt.
Loosen the timing belt tensioner so the belt will have some slack before removing it from a 1985 Honda Civic. Remove the old belt. Install the new belt and make sure the engine is TDC.
You need to loosen the belt tensioner. There is a large bolt that needs to be loosened in the center of the tensioner pulley. Then the small vertical bolt is turned in the direction to loosen the belt. After the tensioner is loose replace the belt and retension it.
There should be a small square hole near the tensioner pully. A 3/8 socket driver will fit in the hole and then you can losen the tensioner.
Loosen the tensioner pulley. When the tensioner pulley is loose the belt will come off. Put the new belt on and tighten the tensioner pulley.
I will assume that you are replacing the belt here. The tensioner has a large bolt on the front of it, find a socket to fit and pull or push, which ever way seems to loosen it for you, they are automatically adjusting so when reapplying the belt just move it out of the way again and slowly release it back onto the belt.
Loosen the tensioner pulley. The tensioner pulley will slide to the right. This will loosen the alternator belt. So it can be removed.
The power steering unit and the alternator are both driven by the serpentine belt. Loosen the tensioner pulley and the serpentine belt will become loose. Put the new serpentine belt on and tighten the tensioner pulley.
Place a breaker bar on the lug/hole on the tensioner; then pry against the tensioner.