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 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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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...

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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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A/c only runs through the defrost vents.


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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91 accord engine squeal

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

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