Question about 2003 Mitsubishi Lancer

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A/c only runs through the defrost vents.

Belt squealing when first started in the morning. Squeal eventually goes away. Have replaced alternator belt, air conditioner belt and power steering belt. My air conditioning in my 2003 lancer pushes the air solely through the defrost vents? why??????

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  • soccer1bfc May 30, 2009

    is that like a common problem?

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Change the vent switch.

Posted on May 29, 2009

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2 Answers

Had radiator replaced n a bolt put on alternator which is ok. New noise in idle...it squeals. Gets worse when a/c is on. In idle I pop hood N noise goes away. 2006 tiburon 4 cyl auto


Probably should replace the belt. A worn belt will squeal sometimes.'
Another thought is the belt tight enough A belt that is too loose will squeal under stress .

May 05, 2016 | Cars & Trucks

1 Answer

Can't find the source of the squeal


Year make and model ??
The belt could be glazed and slipping even if it is tight.
You could have a weak belt tensioner too.
The noise when the ac or heat is turned on can be the extra load from the ac compressor or the alternator. The compressor cycles on and off especially in defrost mode.
The load from the alternator is the first noise of the day. As the belt warms up it becomes better at handling the load of the accessories.
Even tho the belt looks fine, you may have to replace it to get rid of the noise.

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I have a '99 Honda Civic. Some mornings the belts squeal very loudly for a few seconds. I don't know what belt is sqealing or how many there are that could squeal for that matter. Also when I


its more than likely the alternator drive belt needs re tensioning if its got aircon that belt may cause the same problem just get the drive belts checked and re tensioned

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It doesn't happen everytime but the first time I start my Honda Pilot in the morning it makes a squealing noise. It's a one time squeal and stops. Had the alternator belt replaced and 3 days later the...


the noise is the alternator belt, what maybe going on is you need an alternator. it could be that there is a bearing that is ceasing up when it cools down and when you start it up it takes a min. to get spinning and this is causing to much drag on the belt and making it squeal.

Mar 11, 2011 | 2009 Honda Pilot

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When I turn on the car, there is a high pitch squeal. It last for 10 seconds and then goes away. It usually only happens in cold or rainy weather. Do you know what is going on and what I should do about...


It could be as simple as a loose or worn alternator belt that needs replacement or the cars charging system is not putting enough charge back into the battery under normal running so when first started in the morning the battery requires more power from the alternator which in turn puts more load on the alternator belt, Get the belt checked first then get the battery and charging checked, the first item being the cheapest to repair. Hope this helps.

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Nissan maxima 00 AC belt squeals for a moment and it goes away. If I turn on AC, lights, defrost, the belt squeals. It does not happen at high speed.


this means your belt needs to be tightend, if its not at the proper tension it will squeak at low speeds, especially when you first start your vehicle, and if you turn on your ac.

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1 Answer

A/c only runs through the defrost vents.


CHECK ALL THE VACCUM LINES ON THE FIREWALL FOR CRACKS OR OPENS SEE IF THAT HELPS

Jun 02, 2009 | 2003 Mitsubishi Lancer

2 Answers

Belt squealing when first started in the morning. Squeal eventually goes away. Have replaced alternator belt, air conditioner belt and power steering belt.


The squeal when first started is most likely coming from the alternator belt. You need to have the tension of the belt checked to make sure it is properly adjusted. If you had a shop due it have , have them recheck it. Or stop by a local shop and they shouldnt charge you to check it. But its all in how you ask, if you go in and tell them your problem most likely they will try to get you for a fee to diagnose it.Just ask to have them check the belts and make sure there tight.If its ok, has anyone tried to fix your sqeul by spraying anything on it? if so your belt could be slipping from the lube they used. there is one more thing you can try, providing all the pullys/ tensioner pully if equiped are straight. If it is a serpantine belt(flat/multiple grooves) not A v-belt
when the engine is off,you take a tablespoon or so of corn starch, yes the stuff in the yellow box in the kitchen, and put it on the inside oif the belt. Its acts like a dry lube. I learned this trick at the GM dealership, from a factory bu;lliton. good luck

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4 Answers

91 accord engine squeal


there's your problem......you have a cheap alternator. Buy atleast refurbished never used once especially from a junk yard. Sounds like the pulley is worn.

Sep 22, 2008 | 1991 Honda Accord

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