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Re: how to fix a belt that is making a loud noise on a...
If it is a loud squeaking sound, the belt is stretched out too far for the tensioning pulley to take up the slack. Check if the belt has grease or oil on it. If it does find the cause, fix the cause and then change the belt...there is no tension adjustment to be made,
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Well,a drive belt needs to be replaced every 50,000 mi. or so,and a weak tensioner can allow slack which causes sqeak even if the belt is good. The idler pulley on those is easy to replace also. If the tensioner isn't holding the drive belt very tighly,replace it and the belt. Auto Zone will let you put down a deposit and borrow a tool to work the tensioner so the belt can be easily removed. don-ohio
I would think more along the lines of the idle stepper motor or a bad vacume leak or airflow sensor or intake leak but I havn't seen the car. The A/C however does also control the idle it makes the idle higher when th A/C engages to cope with the load but if the A/C is off & yu expeirience the prob then I would sugest the A/C is not to blame. The A/C belt runs on the Idler & tensioner pully & I assume they were noisy & better to replace then have them seize & throw the belt which could cause other damage
if the compressor bearing seized or fell apart than that would cause the belt to break or fall off. You cannot bypass the a/c compressor with a shorter belt. You can either replace the compressor or get a compressor bypass pulley but then you will not have a/c ever again until you install a compressor.
there is two easy solutions for this you can do yourself. either rub a bar of soap on the belt or squirt some wd40 on it. If you squirt wd40 while it is running, it may splatter and fly.
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It amazes me that they didn't at least address the rattling noise, seeing how they probably caused it. If it is just a belt, that's an easy fix. Did you stop at another shop & ask for a quick diagnosis? Could be something as simple as a heat shield , or something. Doesn't hurt to have a second opinion, and shouldn't cost anything, or very little, then go back & tell them what the diagnosis was.