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Check the fan belt it may be tight when cold and causes the whistle until it loosends up when it warms up during use. Can also be caused by the throttle body needing to be cleaned, carbon build up on the IAC motor

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โˆ™ 2008-12-10 18:27:32
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Q: What could cause your 2004 Jeep Grand Cherokee's engine to make a faint whistling sound in cold temperatures when it is first started?
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