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NO belt in the 302cid engine of a 1988 Mercury Grand Marquis. it is a chain with gears
Chain
diagram for 2003 grand marquis belt installation
You can't, the serpentine belt (or fan belt) on a grand marquis is equiped with a self tensioner, if your belt is making noise it either needs to be replaced or one of the pulleys on the cars may be loose and would need to be replaced.
how to change fan belt
Yes. Disconnect the belt & it will run fine.
Had that problem in my 1996, solved by replacing the serpentine belt and belt tensioner
It does not have a transmission belt.
no timing belt
The 2005 Mercury Grand Marquis , 4.6 liter SOHC , V8 engine has ( 2 ) timing chains ( 1 timing chain to each cylinder head )
It does not have a belt, it has a chain.
Most likely the ac belt is loose and needs to be tightened or replaced.