Notice: The air hose test should only be used on fully cured urethane adhesive. Otherwise, damage to the urethane adhesive bead could result in additional leaks.

Put liquid detergent diluted with water in a squirt bottle.

Have a helper inside the cab with an air hose.

Beginning at the bottom of the window and gradually moving up the window edges and across the top, squirt soap solution on the window moldings and the glass on the outside of the vehicle.

Important: Do not allow the air pressure from the hose to exceed 205 kPa (30 psi).

Have a helper aim the compressed air at the same locations from the inside of the cab.

Bubbles will form in the soap solution at the location of the leak.