My 06 gmc envoy makes a squeking noise like belts do but my belts look fine and there prety well tight could it be any of my pilleys

when engine get warm oil get thinner so it can leak from a small hole
belt will make noise on dry pulley change belt

The belt tensioner on right side of engine, if you are facing vehicle, just below the altenator, is probably the problem. Mine made the noise all the time, bought part at Autozone, 18.99, its fixed, no noise.

I guess my first question would be are you sure you got the right replacement belt ? And are all of the pulleys on straight ?
Is the belt slipping, or coming off ?
Was the original belt giving you problems ?

Have you checked the tension on the alternator or any other belt drive in the engine bay?

Can you tell where the noise is coming from ?
Engine compartment ?
Exhaust pipe or muffler ?

If the pulley is loose and the bolts are tight, chances are the water pump bearing has failed.

{: ) There are shops that has these gadget to test the battery and charging systems at the same time. As of the time being, you can clean battery terminals for presence of corrosion, to have that clean tight connection to the battery. Check also your engine belt.
If you have a reliable digital multimeter, you can measure the charging voltage at the battery terminals when the engine starts to run. Should be around 13.8 to 14.5 volts depending on the loads that are on.
If the charging system seems to be okay, and you go for that new battery, check and observe again. If the same problem, you should have your vehicle tested for abnormal battery parasitic draw.

There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.

Mine did the same. It was a bad idler pulley

I had the same problem on my 2005 Envoy. Turned out to be the idler pulley bearing. It is just a pulley the belt rides on. The bearing in the pulley was what was making the high pitched whine. I replaced the bearing, and the noise went away.