Leak Testing - Off-Vehicle

CAUTIONS:
^ Do not use boil-out tanks or vats or other tanks that have been used for copper and brass radiators. The flux, acid and caustic cleaners remaining in these tanks will attack the aluminum and cause radiator failure. A separate test tank containing clean water is strongly recommended for servicing aluminum-plastic radiator.
^ Never use compressed air to pressure test radiator that Is not regulated to 138 kPa (20 psi). Pressures over 138 kPa (20 psi) will damage the radiator.

1. Install test fittings or rubber test caps in the inlet and outlet necks and seal the oil cooler footings with metal plugs to protect the cooler and keep the fluid from running out.
2. Attach pressure tester and gradually apply air pressure until 138 kPa (20 psi) is attained. Do not exceed 138 kPa (20 psi). Check pressure gage to see if there is a pressure loss. To ensure that there are no small leaks, run water over the repair area and look for bubbles (A mild detergent is very helpful.)
^ If a large water tank is available, the radiator can be submerged, and a check for air bubble can be made.