See Windshield Wiper Blade Replacement on page 6-40 of your "Owner's Manual", under Section 6: Service and Appearance Care.....
Replace the paulse board that's attached to the wiper motor.
The linkage bushings are worn/missing/broken or the wiper arms are not timed properly to the wiper transmissions.
wiper motor on lincoln towncar 02
See Windshield Wiper Blade Replacement on page 6-40 of your "Owner's Manual", under Section 6: Service and Appearance Care.....
Replace the hose.
There was a recall on the windshield wiper motors. Check with your locate dealer and they may replace it for FREE!!!!
There is a nut under the plastic cover at the base of the arm.
The A/C low side service port is by the Firewall, just below the Passenger's Side Windshield Wiper Arm.....
The 2002 Jeep Liberty takes 19" replacement windshield wiper blades on both sides front.
The 2002 Chevy Trailblazer takes 22" replacement windshield wiper blades on both sides front and a 16" rear wiper.
The 2002 Chevrolet trailblazer windshield wiper motor should be replaced, when the windshield wipers are skipping. The windshield wiper motor can be located in the engine compartment.
The 2002 Jeep Liberty rear wiper blade is unique to Jeep. You'll probably have to get the part at the dealer and may be able to ask for the install procedure.