Engine squeak

Hi,

It sounds like it could be the belt. Try this. When the engine is at idle, take a small amount of water and pour it onto the belt. See if the sound chances or goes away.

Here is a link that discusses common issues with a worn belt or other issues related to the belt:

https://www.2carpros.com/articles/car-squeaking-noise

If you determine the belt is bad, here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/replace-serpentine-belt

If you find the belt is not tight enough, there is an automatic tensioner that will need replaced. Here are the directions for that. The attached pictures correlate with the directions.

___________________

2005 Chevy Truck TrailBlazer 4WD L6-4.2L VIN S
Drive Belt Tensioner Replacement
Vehicle Engine, Cooling and Exhaust Engine Drive Belts, Mounts, Brackets and Accessories Drive Belt Tensioner Service and Repair Procedures Drive Belt Tensioner Replacement
DRIVE BELT TENSIONER REPLACEMENT

Drive Belt Tensioner Replacement

Removal Procedure
1. Remove the drive belt.
2. Remove the drive belt tensioner bolt.

pic 1

3. Remove the drive belt tensioner.

Installation Procedure

pic 2

1. Install the drive belt tensioner.

2. Install the drive belt tensioner bolt.
Tighten the drive belt tensioner bolt to 50 Nm (37 ft. lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the drive belt Drive Belt Replacement.

_________________________________

I highlighted the tensioner in pic 2 for you. Let me know if this helps or if you determine the belt isn't the issue.

Take care,
Joe