Check for disconnected or broken linkage or a bad wiper transmission
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The service port is by the Firewall, just below the Passenger's Side Windshield Wiper Arm Shaft.....
Check for broken or disconnected linkage Bad wiper transmission?
The A/C low side service port is by the Firewall, just below the Passenger's Side Windshield Wiper Arm.....
If equipped, there is a door in the wiper cowl, base of the windshield, passenger side.If equipped, there is a door in the wiper cowl, base of the windshield, passenger side.
The windshield wiper relay is under the dash on the drivers side of the passenger compartment.
The windshield wiper relay switch can be found on the firewall in the engine compartment. The windshield wiper relay switch will be on the passenger side of the firewall.
The 2000-2010 Chevrolet Impala takes 22" replacement windshield wiper blades on both sides front.
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See Windshield Wiper Blade Replacement on page 6-40 of your "Owner's Manual", under Section 6: Service and Appearance Care.....
The 1993 Pontiac Transport windshield wiper control module is located on the firewall in the engine compartment. The windshield wiper control module will be on the passenger side of the firewall.
The linkage bushings are worn/missing/broken or the wiper arms are not timed properly to the wiper transmissions.