Cooling System: Testing and Inspection

3MZ-FE COOLING: COOLING SYSTEM: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT FOR COOLANT LEAK (for Engine)
CAUTION: Do not remove the radiator cap while the engine and radiator are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.





(a) Fill the radiator with coolant and attach a radiator cap tester.
(b) Pump the tester to 118 kPa (1.2 kgf/cm2, 17.1 psi), then check that the pressure does not drop.
If the pressure drops, check the hoses, radiator assembly and water pump assembly for leakage. If there are no signs or traces of external engine coolant leakage, check the heater core, cylinder block and cylinder head.
2. INSPECT RESERVOIR TANK ENGINE COOLANT LEVEL (for Engine)
(a) The engine coolant level should be between the LOW and FULL lines when the engine is cold.
If it is below the LOW line, check for leakage and add Toyota Super Long Life Coolant (SLLC) or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the FULL line.
NOTE: Do not substitute plain water for engine coolant.

3. INSPECT ENGINE COOLANT QUALITY (for Engine)
(a) Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator assembly.

(b) Check for excessive deposits of rust or scale around the radiator cap sub-assembly and radiator filler hole. The engine coolant should be free of oil.
HINT: If excessively dirty, replace the engine coolant.

(c) Install the radiator cap.