Yes ( it's fuel injected )
Yes.
no
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
The cabin air filter, in your 2004 Mercury grand Marquis, is located behind the dashboard on the passenger side. The air filter is directly behind the glove compartment.
No. A 2001 Jeep does not have a cabin filter.
99 G/M has no filter.
That car doesn't have a cabin filter.
The 1997 Mercury Grand Marquis owners manual shows : ( Motorcraft FL-820S ) and fordparts.com shows : ( Motorcraft FL-820 ) for the engine oil filter
( 5 quarts with filter change ) according to the 1999 Mercury Grand Marquis owners manual
( 6 quarts with engine oil filter change ) according to the 2003 Mercury Grand Marquis Owner Guide
I would say ( No ) I was looking at the 2002 Mercury Grand Marquis Owner Guide and it doesn't show any reference to a cabin air filter
on my 96 grand marquis its on the driver side uder the car right below the back door