An ABS fault.
bearning on front breaks burn out
Since the first model year of the Mercury Mountaineer is the 1997 model it would be ( r134a )
No , ABS is the anti-lock brake system
Check the main crank pulley.
rings or seals
Bearing in: Alternator? Water pump? A/C Compressor? Belt tensioner?
That would be the 4.6 liter engine, which takes six quarts. * of 5W-20 according to the 2003 Mercury Mountaineer Owner Guide
Vacuum leak in a/c door control system . Look for vacuum leak under the hood.
Check into the ABS pump or module ---- I would say the pump
On a 1997 Mercury Mountaineer : I assume the fuel filter would be in the same location as a 1997 Ford Explorer : ( underneath the Mountaineer , below the drivers door , mounted on the frame rail )