Insert a 16 mm (5/8 in) drill bit into the frame to body alignment holes in order to inspect the frame to body alignment.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Inspect for obvious floor pan deterioration.
3. Inspect for loose dirt and corrosion around the inside of the floor pan reinforcement member access holes. This is the first indication that corrosion exists in hidden areas.

Perform all repairs before the final cleaning and the protective treatment.

4. Using a chisel, ensure that the drain provisions in the floor plan reinforcement members are open.

Open the drain holes in the body side panels using a punch and a drift.

5. The side panel drain holes are in the rear section of the following panels:

•	The rocker panels

•	The lower rear quarter panels