Pressure Testing - On-Vehicle

CAUTION: Pressures above 138 kPa (20 psi) should not be used when testing the cooling system. Pressures over 138 kPa (20 psi) will damage the radiator.





You can pressure test the aluminum plastic radiator with a common pump and gage. With the system at a cool temperature, remove the radiator cap, connect the gage, and apply normal system operating pressure. Do not exceed 138 kPa (20 psi). Watch the gage needle for an indication of a leak, and examine the radiator and other cooling system parts for signs of escaping coolant. Repair all hose and hose connections as required. Also check radiator cap to ensure that it will maintain the correct pressure. If the radiator is found to be leaking during the pressure test, mark the leak area so that it is easily found once the radiator has been removed from the vehicle.