no freon, bad relay or fuse, bad A/C clutch, bad A/C pressure switch...etc.. theres a new kit available at parts stores called "A/C for DUMMIES" and comes with Freon and hoses, and all you'll need to check the systems... good luck, also ...everyone should have a manual for their vehicle(parts store or dealer), and a local library should have professional shop manuals available in the REFERENCE section for free...make copies of the appropriate sections...read up and good luck :)
the blend door actuater is bad
An ABS fault.
Pin cone
bearning on front breaks burn out
No , ABS is the anti-lock brake system
Since the first model year of the Mercury Mountaineer is the 1997 model it would be ( r134a )
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