Question about 1998 Saturn SL

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What is the problem if it is making a loud screeching noise when running

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Hi, the alternator BELT or bracket may be loose (only when drive off at speed or reving the engine, mainly first thing in the morning). can also be brakes binding (the brake shoes rubbing on the brake drums). road stone traped in between the brake disk and brake disk cover. check this item
can be front wheel bearings (worn) or dry of grease (broken rubber (boot C V joint), all grease displaced (front wheel drive car only). fan rubbing on fan housing. check this item
NO OIL IN the ENGINE and internal bearings very worn. (please check engine oil level). clean dip stick and replace take it back out and read the level (level ground only). gerry

Posted on Sep 13, 2010

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Could be a bad bearing in something being spun by the serpentine belt. Could be serpentine belt needs replaced, or the tensioner is going bad. If the belt and tensioner are good, a human with a half a lick of sense can place the tip of a very long heavy duty screwdriver against the units being spun by the belt, one by one, and the handle end against their ear. When you place the screwdriver against the bad bearing unit, you will immediately hear it through the screwdriver. If you have long hair or no sense, then do not do this as it may be your last moment on earth.

Posted on Sep 13, 2010

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1 Answer

Car makes very loud screeching noise.


It could be that the air conditioning compressor clutch is not working properly. The clutch should allow the pully to freewheel when the air conditioner is not used.
You can have your battery tested at.an auto parts store, and you can test the alternator by removing a battery cable while the engine is running. The alternator is what powers all the electrical systems while the engine is running. If the engine stops running when the cable is removed, this means that the engine was running from the battery and not the alternator.
Your alternator or your regulator is bad.
Regulators are an internal part of alternators, unless its a pre 70's.car where they were a separate external unit.
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could be your serpentine belt. usually when they get worn they will start to either slip or cause a very high pitched screeching noise. to verify that is the cause get some water or brake clean in a spray bottle and spray it on to the belt while the vehicle is running. if the noise goes away for a moment you found your cause. if not then its something else. Hope this helps

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I have a 99 Ford Superduty 7.3 Diesel. It is making a really bad grinding/screeching sound just after it starts and is warming up. It wouldn't ******* off all the way even after the key was turned


indicates that the starter motor is stuck in the ring gear
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I have a 1990 jeep YJ replaced the alternator and now there is a loud screeching noise replaced the belt,replaced new bearing in idler pulley still makes a loud screeching noise?


If the belt is not tense enough it will squeal, so make sure it's tight enough. Otherwise you can use a stethoscope or long screwdriver up to your ear to isolate the source of the noise.

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My serpintine belt started making a loud screeching noise, and eventually slipped off. I got it put back on but its still making a screeching noise. All of this started after i got the AC compressor fixed....


One of the belt pulleys likely has a bad bearing. watch the pulleys for binding while it's running or remove the belt and check each pulley by hand. AC puts more strain on the belt...if the belt is not new and pulleys check out, (and tensioner is working properly) change the belt.

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the screeching noise is most likely caused by a slipping belt or pully. transmission probably needs fluid and filter changed.

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