Question about 2000 Ford Focus

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When I turn ac on it is really loud under hood. Sounds like a loose pulley or fan, but when you open hood there is nothing that you can see that is going wrong. Is there a place to insert oil or grease to quiet it down or is something else? only when yourn turn it on.

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If the belts are making noise when you turn the a/c on, the a/c compressor or belt may have issues.

Posted on Jun 27, 2009


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3 Answers

Screaming noise from ac no cold air

It sounds to me that your belt or tensioner is worn, if the noise goes away when the ac is off then it is just the belt slipping, it takes a lot of power to run the compressor and if the belt is worn it most likely slipping on the pully when you engage the clutch.

Aug 09, 2014 | 2000 Buick LeSabre

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What causes power loss in engine and transmission and a loud thumping somewhere under hood

This could be serious First look & listen to the engine with the hood up to find anything loose like the fan, serpentine belt etc. Also get under the vehicle and look at the universal joints. Unfortunately, from your description, it sounds more like the auto or transfer case. With luck, it may just be the linkage but get it checked before something really serious occurs. Se my article "Noises and wht they might mean" at

Jul 07, 2014 | 1998 Land Rover Range Rover

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When i run the ac there a loud screech for a little bit the when i sop i will see a smoke comming for under the hood.

probally an wrecked bearing in the ac compressor. or a bad clutch on the ac compressor

Dec 05, 2010 | 1995 Isuzu Pickup

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1992 Pickup: loud squelling sound under hood when started...

Sounds like a loose belt.

There are a few things that can cause a belt to slip like that.

The belt could be not tightened all the way. If it uses a sepentine belt with a tensioner, the tensioner could be bad. If it is not a serpentine belt, then you will have multiple belts and the one that is making the noise can be loose. Use something to pry it tight and tighten down the bolts holding the component th belt goes to.

It can also be a bad pulley. Pulleys have bearings inside of them, at times the bearings will go out and make the pulley hard to turn. You can usually find this easily by taking the belt off and turning the pulley with your hand. If it is hard to turn or makes a grinding noise when is bad and needs to be replaced.

Old belts can also cause this along with a belt that is wet. There is a spray on Belt Dressing that helps get rid of noisy belts, but I consider that a bandaid to a bigger problem.

May 03, 2010 | Toyota Cars & Trucks

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When I start my car it squeals really loud and smells like a vaccuum belt is burning. it also overheats while sitting still unless the air conditioner is on and now won't pass emissions. what could be...

Your squeal sounds like you have a pulley frozen, or sticking, that the belt can't turn, and it will burn. You need to determine which pulley or idler pulley it is.
The cooling problem may be related (water pump) , or just a failing fan switch, or fan. See if you have two, as some vehicles have one, and a second for air conditioning.

Dec 09, 2009 | 2000 Mitsubishi Eclipse

1 Answer

Loud clanking noise just started still running , under hood in engine

Check and see if your tensioner or your idler pulleys are worn on your serpentine belt.
- Check and see if your fan clutch is loose or the the fan is striking the fan shroud .

Aug 14, 2009 | 2001 Dodge Grand Caravan

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A/C does not blow cold when stopped or moving under 25 MPH

There is either an electric fan that sits at the front, or a relay operates the cooling fans to turn them on for the AC. Sitting there idling and the hood open, turn on the ac and see if a fan kicks on. If it doesn't then check your fuses and the relay for it. If it does then you just need more freon. But it really sounds like the fan(s) are not kicking on to push air through the core.

Jul 12, 2009 | 1999 Cadillac DeVille

1 Answer

Screeching noise, then a/c stops blowing cold air. Still blows air, just not cold air.

it could be the air conditioning clutch going out. to check turn your car on and idle it with ac on and hood open. at the ac compressor it will have a pulley on it with a clutch that engages when the air conditioning is on. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if the pressure gets too high in the ac system. Depending on the year of the vehicle it will disengage at full throttle and come back on when you are not at full throttle.
If it is a metallic sounding screech for example take a coke can and drag it across pavement kind of sound it could be a bad compressor or a bad ac clutch. If it is a more rubbery sound for example a car spinning its tires kind of noise it could be a loose belt.

1. Check to make sure all belts are tight under hood
2. start car and look at ac compressor to make sure compressor pulley is turning and that the fan clutch is engaged spinning

Aug 09, 2008 | Mercedes-Benz 400-Class Cars & Trucks

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