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Engine belt broke on 1994 blazer now something wrong with a/c pulley whines afraid to run a/c

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If it whines when you don't have the a/c on it is probably the bearing in the idler.

Posted on Jun 21, 2009

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Check your tenisoner pulley they have bearings in a coupl;e of them just wiggle them with the belt off if one of them move in and out they need to be replaced try all the pulleys even the water pump if you have any question plz write me rad64us@yahoo

Posted on Jun 21, 2009

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1 Answer

How do i know when i got a bad idler pulley on a 98 blazer


Common problems are a noisy belt, the belt comes off or you hear a whine from the pulley bearing.

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If its a whine, most likely the bearings on the idler pulley or the bearings on the ac compressor clutch.
-To trouble shoot with engine running and ac on spray wd40 on bearing area of clutch then wait a few seconds to see if sound goes away. If not then try bearing area(behind bolt of pulley) of idler. This will work as temporay fix, but ultimatly you must replace bad bearing.Do NOT spray on belt or pulley surface.

If its a squeal could be the belt is loose and needs to be replaced or dressed.
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A high pitched whining noise in the engine.


This Noise Description sounds Indicative of the Sounds that come from the Serpentine Belt Or Related parts such as Belt Idler Pulley or Belt Tentioner witch also has a Pulley, but if Tensioner itself is Literally BROKE I've replaced a number like this it will cause a Whining noise . Best case scenario its just the Belt, and if any of the other Problems turn out to be the Culprit the Belt MUST be Replaced Anyhow as Damage is Being caused By the Very Whining you hear.
PLEASE Spend the Extras $ for the BEST BELT as this Drives your Water pump, Alternator, A/C Compressor, Power Steering Pump All Crucial to Control of, easy Steering ,All Electrical-Power Distribution, The COOLING of Engine << VERY CRITICAL Component
The Pulleys usually have a more Hum type Whining. So I would say at Best The BELT , And WORST Belt Tentioner is Broke

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Engine whine


Could be anything that is attached to the serpentine belt. ie: starter, water pump, A/C compressor, tensioners, steering pump.

My guess is a bad idler pulley bearing (cheapest to replace).

How many miles, what year is vehicle?

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1 Answer

Engine whine noise


most likely a belt tensioner or pulley take some penetrating oil and spray the center of each pulley one at a time if the noise stops you got your bad pulley if not take the belts off the motor and spin everything by hand to feel or hear any grinding noises if you still don't feel anything run the motor (not for more then a minute) with the belts off and if the noise is still apparent your timing belt needs to be checked right away! it may be on its way out and if that goes your motor is toast good luck and please rate -jeff

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