WHISTLE NOISE

Asked by Mar 13, 2017 at 05:16 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

VERY HIGH PITCH WHISTLE ALMOST A DOG WHISTLE COMES FROM UNDER THE DASH ONLY WHEN CLIMATE CONTROL IS ON EVERY THING WORKS THO COLD AC HOT HEAT DEF ALL FINE , DIDNT HAPPEN FOR MONTHS NOW ALMOST ALL THE TIME?

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If your system uses vacuum operated actuators there might be a vacuum leak.

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