Ultraviolet Light Method

A leak detection additive is available through the parts department that can be added to cooling system. The additive is highly visible under ultraviolet light (black light) (1). Pour one ounce of additive into the TPIM cooling system. Using the scan tool, cycle the coolant pump. Aim the commercially available black light tool at components to be checked. If leaks are present, black light will cause the additive to glow a bright green color.