To open the Chevy truck hood from the outside, you can use a long, thin screwdriver or a wire coat hanger. Make sure the coat hanger is sturdy. You may need a flashlight to see through the grille to see the lock mechanism. It won’t be clear, so you’ll do most things blindly. Insert the screwdriver through the grille toward the locking mechanism, and find the latch hook. Push it toward the left or right (with enough force) to see the side that releases. The hood latch will disconnect to allow the hood to pop open.