Question about 1999 Mercury Mountaineer

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1999 merc mountaineer,

Upper idler pulley was replaced and squeals now

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Check if there is any obstruction in the path of the pulley or the belt is too tight or this may not be correct one get it fixed by using a correct belt.............

Posted on May 29, 2008

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Tensioner bolt bottoms out on idler pulley (belt for Poly-V A/C & Idler) on 2000 Nissan Pathfinder SE


Pulleys also wear.
You've changed the belts - a workshop would then change that particular pulley, if asked to do so.

Start your engine, then put a few drops of water onto that pulley. Does the squealing noise disappear? If so, the pulley is slightly worn in the groove - and this happens to all vehicles.

Your option is to either replace that pulley or use a spray-on anti squeal compound.

Generic images below:
belt anti squeal Google Search

Mar 09, 2016 | 2000 Nissan Pathfinder

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.0 engine on 2003 ford ranger replaced idler pulleys, fan belt, still doing it what could it be?


a faulty belt tensioner pulley could be cause of belt slipping squealing

Feb 13, 2013 | Cars & Trucks

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Is there any short term way to stop the squeal of an idler tension pulley?


you can buy idler tension pulley pretty reasonable.should cost over hundred dollars.auto parts stores has them wont cost as much but dealership idler tensioner will cost more.should be able to buy one at least little above $60.00

Sep 04, 2012 | 1999 Oldsmobile Eighty Eight

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Idler pulley burning belt rubber. idler bad?


yes, if it is frozen up the belt will squeal and burn up ! you can go to any auto parts store and tell them you need a idler pulley for your vehicle. good-day !

Mar 16, 2012 | 1996 Jeep Grand Cherokee

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Ac clutch squeals when i hit the gas no matter if ac is on or off but not at idle 98 jeep gc 5.9 need steps to replace clutch assembly


Are you certain that it's the clutch assembly?
Check the idler pulley. Poor tension in the idler pulley spring will cause the belt to squeal AT THE ALTERNATOR, and it may sound like it's coming from the AC.
The AC pulley typically "freewheels" when the AC is not on and the engine is running.
Have someone turn the AC on and off while the engine is running and watch the operation of the AC clutch. If it's working properly, the clutch should "click" and the back part of the pulley should start turning or try to turn.
If the squealing noise continues when the clutch is freewheeling, it's probably the idler pulley. If the AC Pulley won't start freewheeling, it's probably the clutch.
To remove the clutch system,
  • disengage the idler pulley and remove the serpentine belt from one of the pulleys.
  • rent, purchase or borrow a puller from a local auto parts retailer (Auto Zone and O'Reilly auto parts are both helpful)
  • some of the clutch systems have retaining bolts, some are just pressed in, figure out what you have before removing the clutch assembly using the puller.
  • The puller is also designed to help put the NEW clutch assembly back on the shaft.
The idler pulley assembly is a lot easier to replace.

Feb 19, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Replaced the serpentaine belt , the idler pulley and the belt tensioner now the belt is loose any suggestions


The most glaring possibility is whether or not it is the correct belt. I like to lay the old one out next to the new one to verify that they are identical in length. Did the old belt squeal and then break? If so, something was trying to lock up. If something other than the idler pulley was going bad, you may still have a squealing belt because it can't pull the "bad" unit. I recommend you take the belt off verify that it is the correct belt. If so while the belt is off, inspect every pulley on the belt circuit. Each pully, except the crankshaft, should turn freely and have no wobble play at the bearings. If any components have a grinding feel to them when you turn the pulleys, it needs to be replaced.
Good luck, hopes this helps you.

Sep 12, 2010 | 2005 Mercury Mountaineer

1 Answer

Mercedes 02 c240 makes clicking noise for 2-3 min when starting


clean all pulleys with a degreaser for glazed pullys will make any belt squeal

Apr 20, 2010 | 1999 Chevrolet Tahoe

4 Answers

1999 dodge durango 5.9 v8 loud squealing noise from under hood replaced tenison pulley, idler pulley, ac pulley/clutch assembley,and belt please help


You didn't mention the alternator, power steering pump, or water pump. In fact, any pulley other than the crankshaft one can have a bad bearing or dry seal. Remove the belt and spin each pulley while listening for any rough noise or squeal. If it was the crankshaft, it might be time to check the oil. Start the engine with the belt off to see if it does squeal. Make sure the noise isn't coming from the radiator fan(s).

Nov 17, 2009 | 1999 Dodge Durango

1 Answer

Major electrical problems, and then some...


If its still squealing after you have replace the belt, it is likely that one of the idler or tensioner pulley bearings have went out. You can pull the belt off and then try and wiggle the idler and tensioner pulleys and if any of them have wobble in them then that is the one that needs to be replaced.

Dec 31, 2008 | 1999 Saturn SL

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