The Transmission Fluid can only be checked with a special tool from Mercury (there may be aftermarket tools). A plug on the underside of the transmission must be pulled and the tool inserted. The short answer for regular driver maintenance is, "No."
There is no transmission dip stick for a 2002 mercury mountaineer, fluid will need to be checked from under the vehicle. There is a fill plug on the transmission, remove the plug and fluid level should be up to the level of the plug hole. This is the only year mercury did this in the mountaineer.
Starting with the 2002 model , there is no automatic transmission fluid dipstick on the Mercury Mountaineer ( and the Ford Explorer , 4 door )
The 2004 Mercury Mountaineer does not have an automatic transmission fluid dipstick . I know that the 2002 and newer Ford Explorer four door versions do not have a dipstick for the automatic transmission fluid level .
Mercon V
According to the 2009 Mercury Mountaineer Owner Guide : ( Motorcraft MERCON - V , automatic transmission fluid is used as the power steering fluid )
Motorcraft MERCON V - automatic transmission fluid - according to the owners manual
According to the 2009 Mercury Mountaineer Owner Guide : ( Motorcraft MERCON-V automatic transmission fluid is used as the power steering fluid )
On a 1998 Mercury Mountaineer : Using a funnel , add the automatic transmission fluid through the automatic transmission fluid dipstick tube . It is located near the firewall , just to the right side ( passenger side ) of the engine , where the transmission is bolted to the rear of the engine . ( the type of transmission fluid to use should be engraved into the dipstick )
Motorcraft MERCON automatic transmission fluid ( 2.64 pints / 1.25 liters ) is used in the transfer case of a 1997 Mercury Mountaineer
Your 1997 Mercury Mountaineer came from the factory with ( Motorcraft MERCON automatic transmission fluid ) in your 4R70W automatic transmission ( the type that you are supposed to use should be engraved in your automatic transmission fluid dipstick just to confirm )
Motorcraft MERCON V - automatic transmission fluid , according to the owners manual
They have a sealed transmission you dont have to fill it. The fluid should be changed around 100,000 and it has to be done by a dealer.