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WARNING: HOT, PRESSURIZED COOLANT CAN Carefully remove radiator pressure cap from filler neck and check coolant level. Push down on cap to reserve/overflow tank hose for internal obstructions. Insert a wire through the hose to be Inspect cams on outside of filler neck. If cams are damaged, seating of pressure cap valve and tester Attach pressure tester (7700 or an equivalent) to radiator filler neck (Fig. 4). Operate tester pump to apply 103.4 kPa (15 psi) pressure to system. If hoses enlarge excessively or Holds Steady: If pointer remains steady for two minutes, serious coolant leaks are not present in sys- Drops Slowly: Indicates a small leak or seepage is occurring. Examine all connections for seepage or hoses, gasket edges and heater. Seal small leak holes and inspect system again with pressure applied. Drops Quickly: Indicates that serious leakage is occurring. Examine system for external leakage. If INTERNAL LEAKAGE INSPECTION Remove engine oil pan drain plug and drain a small amount of engine oil. If coolant is present in WARNING: WITH RADIATOR PRESSURE TESTER IS PRESENT. TO RELEASE PRESSURE, ROCK TESTER FROM SIDE TO SIDE. WHEN REMOVING TESTER, DO NOT TURN TESTER MORE Operate engine without pressure cap on radiator until thermostat opens. Attach a Pressure Tester to If there is not an immediate pressure increase, pump the Pressure Tester. Do this until indicated Fig. 3 Leak Detection Using Black Light—Typical 1 - TYPICAL BLACK LIGHT TOOL Fig. 4 Pressure Testing Cooling System—Typical 1 - TYPICAL COOLING SYSTEM PRESSURE TESTER 7a - 30 5.2L ENGINE R1 5.2L ENGINE (Continued) |