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High pitch squeaking noise at idle

2001 mercury sable, high pitch sqeaking noise at idle that turns into a fast knocking sound, it's coming from around the thermostat area, no loss of power

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  • metha3 Feb 15, 2009

    I have the same problem, my car is 1999 Mercury Sable. Oddly enough that it only makes Knocking sounds when I turn the "Cold/Hot Air" knob (on the dashboard) to "Hot" (red), if i turn the knob to "Cold" (blue) the sound disappears! and it has no effect whether I turn the fan on or not. It must have something to do with the heater or thermostat. Does yours do the same thing? please let me know ;)

  • Anonymous Mar 23, 2014

    a/c disconnected, heavy knocking noise at idle speed, sounds to be in crankshaft pulley area

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  • Mercury Master
  • 443 Answers

You might need a stethiscope to hear where this is coming from could be a idler or maybe the tensioner or maybe the alternator .. none of these would bother power

Posted on Jan 26, 2009

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