Rattling nosie

Asked by Jun 29, 2016 at 09:49 AM about the 2004 Mercury Grand Marquis LS Ultimate

Question type: Maintenance & Repair

I have a 04 Grand Marquis  with 75000 miles  I also   
a rattling noise in my engine when I turn on the
A.C. and drive what could it be

7 Answers


The AC clutch is most likely the problem rattling, replacement time.


Check as stated above the A/C clutch followed by the serpentine belt tensioner and idlers.

Okay I know what the serpentine belt are but what are tensioner and idlers


Tensioner is a spring loaded belt pulley that keeps tension on the belt. Idler is a belt pulley that the belt runs on. You should have someone look at it for you.

is making a ticking sound from under the hood

Even if you don't have on your air condition

It is a mercury marquis 4door 1999 making noise up under the hood air condition is not on

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