Question about 2001 Toyota Sienna

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My belt squeels when I turn on the defrost only

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Chances are the belt for the a/c is slipping or the compressor clutch is failing.
When the HVAC is in defrost mode the compressor runs to dry the air blowing on the windshield.

Posted on Dec 12, 2012

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2002 highlander--started squeeling from the belt area in Feb. Had belt replaced, was worn. It would squeel on starting then stop. Now turning on a/c makes it squeel. Fan works and after a little while


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At start up I have a loud squeal on my 99 Mazda 626. Both belts are new and so is the alternator. The squeal only last for about 10 secs or so and goes away. I have started it in neutral and the squeal is...


Does your car have air conditioning.? Most cars use the A/C compressor to dry the air for the defrost. It will also come on for a short time when you first start the car. With the engine running after the squeel has stopped , try turning the A/C on , If the squeel starts again , then I would think your A/C compressor is seized. Also . are you sure the 2 new belts are tight enough?

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I have a 2000 Dodge Intrepid .When I turn on the A/C the belt starts squeeling. I think it broke.The car will start but i have not driven it yet, There is a strange sound that seems to be noticed mostly...


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Squealing when start up, battery power goes down when turn on defrost


The squeeeel on startup is a loose serpentine belt.OR a faulty water pump.The voltage drop is a good indictator the belt tensioner may be playing up.The very 1st thing to look at would be the belt.When you put on the defrost,the alt.loads up and would add to the squeel.Hope this helps

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The squeeling is the belt because the air compresor is likely seizing. At idle it can't turn the compressor, in motionthe compressor probably turns and cools the air. Most air conditioners come on when the defroster is on.

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The Air conditioner compressor is seizing when the compressor clutch trys to engage. When you put on the defroster the air conditioner automatically comes on to take humidity out of air.

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1 Answer

I have a 2001 Sonata. I have a squeeling pulley.


It sounds like you have a worn or streched belt making the sqeeling noise. Whenever you turn on a
device in the car that draws a fair amount of voltage
ie. a/c or headlights it will cause increased drag on
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To adjust the alt-a/c belt loosen the mounting bolts
on the tensioner, then use the adjuster bolt behind
the tensioner pully to loosen and tighten the belt.
Be sure to check the belt for cracks bald spots etc.
While the belt is loose spin the pullys to make sure
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Your belts need replaced. Its the belt slipping that causes the squeel. Sometimes the idle pulley or belt tensioner will make the same noise if wore.

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Could be your altenator is going out? you can spray soap on the belt to make the squeel stop but you ge the altenator check. Most auto parts stores can check it for you with out having to remove it.

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