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If your belt only "screeches" when you first start your engine, the problem is most likely to be related to either your alternator or your air conditioner. Sometimes the bearings in these things start getting worn and cause excess resistance to rotation and will cause a screaching noise that goes away once they are moving. This usually also causes "glazing" on the belt.
Look at the ribbed side of the belt. If it looks "shiny" rather than just a dull black, this is glazing. It may not be necessary at this time to replace anything like the alternator or the air conditioning compressor, but I would recommend replacing a glazed belt and do a THOROUGH check of your pully assemblies while you have the belt off. Spin all of the pullies (including the tensioner and idler pullies) by hand with the belt off. You should not be able to "hear" them spinning. Any pully or component that feels rough or has a rough or rattling sound when you spin it by hand should probably be replaced.
Check for wear or other faults all of the following: The belt, fan clutch, Check A/C compressor&clutch for damage. Check A/C compressor for damaged or faulty temperature switch switching compressor off and on too rapidly, or low oil level.Check A/C hoses for metal A/C Lines vibrating against other components under the hood, or faulty blower motor bushings. Hope this helps you out.
The belt tensioner can cause many of these problems, sometimes the serpentine or fan belt is replaced, but the tensioner is not given much thought, a tensioner that is going out, can cause the belt to not have enough tension to keep the battery charged by slipping, when the clutch on the ac compressor cycles on and off, if the tensioner is to loose, or not tight enough can cause the compressor to vibrate, it can cause wear on other parts attached to the belt even cause pre-mature wear on other pulleys. good luck!
Could be the timing belt tensioner. They are known to make a rattling noise when worn and/or the belt has stretched....When is the last time you had the belt serviced? They should be replaced and pulleys inspected at 100,000 miles. Gates recommends 120,000 miles on their belts. Good luck, i hope this helps.
Both engines .. the four and the six have timing chains.. not belts.. so there is no replacement for the life of the engine.
Some of the six cylinder models did have problems with a Timing Chain tensioner.. if you have the six and it makes a rattling sound when first started..that could be an indicator. There is a TSB (technical service bulletin) on this and it should identify which cars are affected.
This could be caused by different things. It sounds like it may be your timing belt though. If you remove your drive belts (alternator, power steering and air conditioner belts), and then restart the vehicle, if the noise stops, then spin the pulleys you just removed the belts from, to see which one is making the noise. If the noise does not stop, then it is most likely the timing belt tensioner making all that noise and you will need to have the timing belt and associated parts, idler pulley/s, tensioner, water pump and seals replaced. Hope this helps. Have a nice day :O)
well if it is the engine i am thinking of that has the small ac belt with the little tensioner on the passenger side bottom area it is most likely the ac clutch is locking up turn the rear air of have some one rev the motor watch the tensioner if it is moving alot banging into another part making the rattle then you might get ready to have to replace the compressor when it gets worse they usually break the tensioner.