Question about 2001 GMC Yukon XL

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When the ac is on and we accelorate there is a loud hissing noise. I think the belt needs tightend. but cant see what is adjustable. usually the altinator can be adjusted but it doesnt look like it can on this vehicle

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Sounds like u need a new ac belt

Posted on Jul 13, 2010

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My 2001 xterra started making a weird sound between 20 and 35 mph. It sounds like there is a leak in some pressure system.


Common Car Noises and Their Likely Causes Noise More Details Likely Cause Fixing It Clicking noise while turning Starts faint, gradually becomes more noticeable until very loud Failed outer CV joint (constant velocity joint) due to torn boot (most likely) or old age Replace either the whole axle assembly (recommended) or the outer CV joint Water pump noises Difficult to diagnose because of water pump's location Noise usually caused by damage to the bearings in failed water pump Only cure is replacing it. If possible do it at the same time as a timing belt replacement to cut down on labor costs Squeak or squeal from an engine belt Loud, high-pitched squeak or squeal Belts either need adjustment or replacing If belts only squeak when damp, they probably just need adjustment. If they squeak constantly, they probably need to be replaced Exhaust heat shield noises Rattle that you hear when car is idling Damaged heat shield Replace heat shield

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A slipping belt makes a loud squeaking noise when the engine is running. The belt needs to be changed if it is cracked or fraying on the side, or if it begins to slip.

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I have a 2001 Isuzu Rodeo. When starting, it has a loud skreeching noise and when theres a load on it. I have replaced the belt, 2 idler pulleys, alternator, a dummy water pump pulley, and the ac. Still it...


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You'll usually hear the noise right at start up and it will continue for close to a minute until the idle of the car changes.

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Belt problem?


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I think the air compressor is bad in the truck


If your refrigerant level is OK and the truck blows cold air your compressor should be fine, in which case the noise is probably coming from the AC clutch which isn't too expensive or difficult to replace. If it doesn't blow cold air, switch the AC on and watch the compressor. If the clutch engages, but the compressor doesn't turn, the drive belt will squeal loudly and probably start to smoke. In that case it is the compressor which is expensive to replace. Most vehicles have an AC bypass that will temporarily cut out the compressor clutch under heavy load. If you are going uphill with the AC on or accelerating heavily you might notice warm air coming out of the vents for a short period until you let off the gas.

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