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I just noticed, although it may have been going on for some time, a short (about 2 seconds long) high-pitched whistle whenever I turn off my engine. There is no perceptible noise when starting up or running - just when turning the engine off. The noise is definitely coming from the engine compartment. If I listen with the bonnet up I hear a hissssssss and then the whistle after I turn the key to shut the engine off.
Any ideas? Belt, maybe?
[I have a 15% pulley and a 2% crankshaft pulley installed. They have been in for almost a year. I don't recall hearing the whistle immediately after the install.]
BlooMeeni - 2004 Mini Copper, Auto A/C, HK Stereo, Leather, 5sp.
