2011 Chevrolet Impala Owner's Manual - Page 288

10-32 Vehicle Care 4. Be sure the two wiper blade element notches are engaged by the last claw set, and that all the other claws are properly engaged in the slots of the wiper blade element on both sides. To remove and replace the wiper blade element do the following: 1. The wiper blade element has two notches at one end which are engaged by the bottom claw set of the wiper blade. At the notched end of the wiper blade, pull the wiper blade element from the wiper blade assembly. 2. To replace the element, start at the heel end of the wiper blade, which is the end nearest to the base of the wiper arm, and slide the wiper blade element, notched end last, into the wiper blade claw sets. 3. To engage the last claw into the notched end of the wiper blade element, squeeze the wiper blade element at the notched area, and push the wiper blade element so the claw fits into the notch. Headlamp Aiming Headlamp aim has been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a crash, the headlamp aim may be affected. Aim adjustment to the low-beam headlamps may be necessary if oncoming drivers flash their high-beam headlamps at you (for vertical aim). If the headlamps need to be re-aimed, it is recommended that the vehicle be taken to the dealer for service. A. Correct Installation B. Incorrect Installation For the proper type and size of windshield wiper blades, see Maintenance Replacement Parts on page 11‑8.