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Old 03-05-2012, 04:43 PM   #1
Join Date: Mar 2012
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Piercing whistle from 2001 Jeep.

hi, i have had my 2001 Wrangler (manual, 5-speed) since I bought it new. In the last 2 years, it has developed a very loud and steady piercing whistle when the engine is running, either at an idle or on the road. my mechanic tried replacing the water pump, serpentine belt and radiator -- but that did not help. he knows a jeep rep and the rep looked at it too. no one can figure out what it is, but it's very loud and high pitched and driving me crazy. any ideas? the Mechanic said that, since it is also happening at a standstill, it can't be wind whistling through a hole in the body. thanks very much!

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Old 03-05-2012, 06:51 PM   #2
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did you replace the idler pully that the belt runs on? It also could be the power steering pump or ac compressor.

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Old 03-09-2012, 09:06 PM   #3
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Wrangler Whistle

thanks, i will check with my mechanic. it happens in the winter, so i don't think it's the ac compressor.
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Old 03-09-2012, 09:11 PM   #4
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Don't rule out the AC the belt turns the pulley even in the winter.
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Old 03-09-2012, 09:15 PM   #5

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If nothing else works, try spreading toothpaste on the serpentine belt. It may sound foolish but it really works.
2005 Jeep Rubicon TJ
Check out my Jeep Profile for details
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Old 03-09-2012, 09:19 PM   #6
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It sounds as though it could be a vacuum line leak.
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Old 03-09-2012, 09:48 PM   #7
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One more whistling thread and we might just call the 4 cylinder engine The Whistler.

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