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SUVs Chevrolet Suburban & Tahoe Noise when accelerating from front air conditioning fan
3 messages, Last post on Sep 27, 2009 at 12:26 PM
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When accelerating from a stop I am hearing a noise that seems to be a belt slipping initially. It only happens when the front fan is turned on. It doesn't matter if the AC is on or off. When the fan is off accelerating or revving the engine doesn't produce the noise. So I was wondering what drives the AC fan? Is it belt driven? Is the AC compressor powered even if the AC is off, and could something w/in the AC system be making the noise?
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Replying to: nukes135 (Sep 27, 2009 7:37 am) Since you mention the fan being 'turned on', I will assume that your fan is the type with electric motors. Assuming that the squeak isn't those electric motors themself, then I would suspect that those motors, are putting an electrical load on the alternator, which in turn is putting a physical load on the serpentine belt. So you could have a worn belt (do you have more than 30-40K miles on this belt?) or the idler pulley for the belt is worn (or has a bearing going bad). Many A/C systems have a clutch on the compressor. So although the outer pulley is spinning with the serpentine belt, only when the a/c clutch is engaged is when the compressor itself is turning and putting a load on the belt.
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Replying to: kiawah (Sep 27, 2009 8:28 am) |
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