Serpentine belt tensioners are notoriously unreliable and can fail for no apparent reason. Also, the springs weaken if they get too hot.
Did the squealing problem start after you drove through a desert in summer, or after the engine overheated?
Cannot tightened. The tension is controlled by a tensioner.
My assumption is that the belt is squealing. Belt dressing may help.
Replacing belt is most effective, even if you just replaced it.
If a new belt does not stop noise (assuming noise is problem) most likely idler or tensioner bearing is bad and the idler or tensioner needs replacement.
You can troubleshoot by carefully spraying a small amount of WD40 on the bearing of each of the tensioner or idler. If noise stops there is your problem. DO NOT get WD 40 on belt. Be careful not to get your fingers in running belt.
The belt is self adjusted by a spring loaded automatic belt tensioner, if the belt is noisy or seems loose either the belt size is wrong (if it was replaced recently) or the tensioner is defective or one of the belt idler pulleys is defective.
SOURCE: 2003 Monte Carlo belt diagram
usually there is a diagram under the hood,have a computor? go to ask.com!
SOURCE: need diagram for serpentine belt on a 2003 monte carlo
http://gsi.xw.gm.com/image_en_us/gif/000/000/043/43400.gif
SOURCE: 2003 Chevy monte carlo 3.4L, need the torque
Check Autozone.com. There repair section should have the torque specs and order of tightening.
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