Question about 1999 GMC Suburban

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I have changed the belt, belt tensioner and alternator. the belt squeals intermittently.

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Still have the water pump pulley, power steering pulley, ac pulley if equiped. pour water and soap solution to one at a time and start engine between every pour of mix to figure out which one is at fault and correct the problem

Posted on Jan 03, 2011

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1 Answer

Squealing noise under the hood


usually from a loose or worn alternator belt/ serpentine belt and worn tensioner.

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Makes squealing noise


The squeal would be the alternator slipping on the belt. I would think either the newly installed belt is not the correct length, or the belt tensioner is no longer doing its job properly.

Jul 09, 2014 | 2006 Scion xB

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85 chevy celebrity. replaced alternator. that one squealed 2. got another. still hear a squeel. does not squeel when belt is off.


ALTERNATOR BELT NEED ADJUSTING AND REPLACING IT GLAZED. WHEN DRIVE BELT GET GLAZED SHINY CAUSE IT TO SLIP AND SQUEAL.REPLACE ALTERNATOR DRIVE BELT. AND ADJUST IT DRIVE BELT TENSION BY TIGHTEN THE UNTIL YOU CAN PRESS DOWN ON THE BELT IN THE LONGEST RUN. YOU NEED TO PRESS DOWN BELT AND GET A 1/4 TO 1/2 INCH DEFLECTION IN BELT.THE BELT CANT BE TOO TIGHT WHERE WHEN YOU PRESS DOWN AT IT WONT GIVE IN NONE TOO TIGHT, WILL CAUSE PREMATURE ALTERNATOR BEARING FAILURE IF DRIVE BELT TOO TIGHT.

Apr 18, 2011 | Chevrolet Celebrity Cars & Trucks

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I have a high pitch squeal from 1998 buick 3.8, told it was water pump, changed, still same, changed belt due to squeal, but still have same sound. Turned on n off a/c comp but did not change anything....


i have the same problem, changed the alternator, pulley and all that, it happened after i had the intake changed out due to the egr problem, if yours hasn't been changed id look into it before it goes, better sooner than later sorta things...

Feb 15, 2011 | 1998 Buick Park Avenue

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The car squeals horribly but seems to get better when it is warmed up,had problems in the summer when after squealing the amber engine light would come on for days on end,car was sent to my misubishi...


Most times the squealing noise heard on start up and for some time after is caused by a loose belt driving the alternator. The alternators job is to replace voltage lost when using anything electrical. Your starter takes more voltage (actually amperage) than just about anything else in the car. If the belt isn't tight enough the belt will slip when trying to turn the alternator till eventually enough power is restored to the battery (while slipping, it's still charging but to a far lesser degree).
Most cars use a spring loaded belt tensioner. If the tensioner spring becomes weak from age, it will allow slipping. If that has been going on for a long time, the pulley on the alternator likely has become glazed and needs to be roughed up a bit with sandpaper or often even after the tensioner has been replaced the pulley will continue to slip. (it takes about 5 horsepower to turn a alternator when it is at its max charging rate and therefore resists being turned)
So, replace the tensioner and make sure the alternator pulley is not glazed and you should not have further problems. Not sure about the light but likely it's related.

Nov 25, 2010 | Mitsubishi Sapporo Cars & Trucks

1 Answer

How do you change the alternator belt on a 2002 toyota avalon xls


There are two bolts on the alternator:
One holds it in position on a rail to adjust belt tension and the other mounts it to a brace. Loosen both of these and angle the alternator to release the belt tension and remove the belt. Put the new one on and reverse your removal technique. You want the belt taut, but not tight. If it squeals when it's running, just adjust the tension to make it a little bit tighter.

Regards,
matt

Sep 15, 2009 | 2002 Toyota Avalon

2 Answers

Squealing losing power not chargeing batter changed alternator


If the belt is 3 yrs old or older, change it. If it has oil or anti-freeze or grease on it, change it. If new, add more tension to the belt.

May 13, 2009 | 1994 Isuzu Rodeo

2 Answers

I have a 2000 geo metro that the fan belt squeals when its cold-do I have to change the water pump when I change the belt?


As long as the squeal is from the belt and the pump is not leaking, I don't see any reason to change the water pump. If it is the main drive belt and not the A/C belt, you use the alternator for belt tension. You don't have to remove the screws, you only need to loosen them enough to allow the alternator to move. If I remember correctly, There are 2 bolts. 1 on a track which allows it to move in and out and the other more or less acts like the hinge. The A/C belt (if you have A/C) has its own tensioner which is easier to get to under the car. 2 screws, 1 locks it, the other is the adjustment. I am going by memory so if I'm not quite right that is why. I hope this helps.

Feb 25, 2009 | 1992 Geo Metro

2 Answers

Loud squealing noise


The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.

Dec 13, 2008 | 2003 Nissan Pathfinder

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