GMC 12399988 Insert,Windshield Wiper

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Removal of the wiper arms requires the use of special tool, GM J-8966 or equivalent pry tool. Lift the wiper arm from the window, then insert the tool under the wiper arm. Lever the arm off the transmission drive shaft. Use care not to damage the paint on the vehicle. Remove the wiper blade from the arm. To install, install the wiper blade onto the arm, position the wiper arm on the wiper motor drive shaft so that the blade assembly rests in the proper park position, and press down on the wiper arm until it is fully seated on the drive shaft. The same special tool for removal can be used for installation.

For the first type blade, press down on blade and release spring. For the second type blade, depress the press-type release lever and slide off the wiper arm pin. For the third type blade, insert a screwdriver under spring and push downward on screwdriver to raise spring.

Insert the tool or a screwdriver under the wiper arm and pry the arm off the shaft, being careful not to scratch the paint. Disconnect the washer hose from the arm (if so equipped) and remove the arm.

Cracked, broken, or torn elements should be replaced immediately.

G.M. J-8966 or equivalent, which is generally available in auto parts stores.

To remove the old wiper blade element, depress the blade-to-arm connector, slide the blade assembly off the wiper arm and over the retaining stud, use needle-nose pliers to push in and pull out the two metal clip, then slide the old element out.

After installing the new wiper blade element, compare it with the old one for length, design, etc. Then, slide the new element into place, reinstall the blade assembly on the arm, wet the windshield or rear window, and check for proper operation.

Use tape on the windshield to mark the exact location of the wiper arm.

If the wiper blade elements are cracked, worn, or warped, they should be replaced with new ones.

Road film can build up on the wiper blades and affect their efficiency.

First, remove the attaching screws and pull out the knob. Then, disconnect the wiring and remove the switch.

To remove the wiper arm/blade assembly, you need to pull it away from the windshield glass while counteracting the tension of the wiper arm spring.

The rubber element can be replaced by either depressing the press-type button and sliding the old element off, or by pinching the spring-type retainer clip together to slide out the old element.

In the other type of windshield wiper assembly, the blades park in a depressed position against a step on the windshield lower molding.