GM 20373667 Arm Asm

Raise the hood and lift the wiper blade off the glass, disconnecting the wiper arm locking retainer from the wiper transmission shaft by prying out the lock. Pull the arm off the transmission shaft, ensuring that when installing the arm, the windshield wiper blade assembly release lever faces the base of the arm assembly for proper alignment with the glass contours. Align the right wiper arm assembly in the parked position and attach it to the transmission shaft, confirming that it is correctly positioned before installation. If the wiper arms and blades were correctly positioned before removal, no adjustment is necessary; otherwise, to adjust the left wiper arm, loosen and raise the left side of the cowl vent screen and loosen the rear wiper link-to-motor crank arm attaching nuts without removing them. Rotate the right arm assembly to a position 3/4-inch below the ramp stops and tighten the attaching nuts on the rear wiper link(s)-to-motor crank arm to 4 to 6 ft lbs. Place the left arm and blade assembly next to the spindle, aligning the slot in the arm with the keyway in the spindle, then push the arm down and place the blade on the ramp stop on the vent screen. Lift the right arm and blade assemblies over the stop, wet the windshield, and check the wiper pattern and parked position, ensuring the distance between the top of the wiper pattern and the left edge of the windshield is 1 to 2 inches, with an overlap of approximately 1 inch at the blade tips. To adjust the right arm, remove it from the driveshaft, determining the correct park position and wiper pattern dimensions with the wipers operating at low speed on a wet windshield, and finally, reinstall the cowl vent assembly.