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Q: 95 grand Marquis GS

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I have a 95 grand marquis gs when i turn on the heater or AC it makes a loud noise....
My car has an automatic transmission.

You may have a blower motor with debris that got into it from under dash. It may be paper or other debris that are in the fan blades and will make a rattle slapping noise and can only be cleaned out by removing the blower motor and cleaning it out.

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