It is the I.A.C. (idle air control) located inside plenum. Dealer normally stocks this part. approx. $50.
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
no
Yes.
somewhere
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.
99 G/M has no filter.
No. A 2001 Jeep does not have a cabin filter.
That car doesn't have a cabin filter.
If there is a PVC valve and hose and filter connected to the air intake, oil could be sucked up from the valve covers when the throttle is applied. perhaps the PVC valve needs to be changed.
motorcraft 820 S
According to the 1998 Mercury Grand Marquis Owner Guide ( and one of Fords websites ) The ( Motorcraft FL-820-S ) engine oil filter is used
The 1997 Mercury Grand Marquis owners manual shows : ( Motorcraft FL-820S ) and fordparts.com shows : ( Motorcraft FL-820 ) for the engine oil filter