Chevrolet Silverado Classic 2007 Owner's Manual page 544

To replace the windshield wiper blade assembly
do the following:
1. Lift the wiper arm away from the windshield.
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2. Push the release lever (B) to disengage the
hook and push the wiper arm (A) out of the
blade (C).
3. Push the new wiper blade securely on the
wiper arm until you hear the release lever
click into place.