Cooling System Lexus LS III рестайлинг

Scheme 2

1. CHECK COOLING SYSTEM FOR LEAKS 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. Fill the radiator with coolant and attach a radiator cap tester. Warm up the engine. Using the radiator cap tester, increase the pressure inside the radiator to 137 kPa (1.4 kgf/cm 2 , 19.9 psi), and check that the pressure does not drop. If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found, check the heater core, cylinder block and head.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR Check that the engine coolant level is between the LOW and FULL lines when the engine is cold. If the engine coolant is low, check for leaks and add "Toyota Super Long Life Coolant" to the FULL line. If "Toyota Super Long Life Coolant" is not available, use a similar high quality ethylene glycol based non-silicate, non-amino, non-nitrite and non-borate coolant with long-life hybrid organic acid technology. Do not substitute plain water for engine coolant.
3. CHECK ENGINE COOLANT QUALITY Remove the radiator cap. 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 caused and cause serious burns. Check if there are any excessive deposits of rust or scale around the radiator cap and radiator filler hole, Also, the coolant should be free from oil. HINT: If excessively dirty, clean the coolant passage and replace the coolant. Reinstall the radiator cap.

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1. INSPECT THERMOSTAT HINT: The thermostat is stamped with the valve opening temperature. Immerse the thermostat in water and gradually heat the water. Check the valve opening temperature. Valve opening temperature: 80 to 84° C (176 to 183°F) If the valve opening temperature is not as specified, replace the thermostat. Check the valve lift. Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F) If the valve lift is not as specified, replace the thermostat. Check that the valve is fully closed when the thermostat is at low temperatures (below 40°C (104°F)). If not closed, replace the thermostat.
2. INSPECT RADIATOR CAP SUB-ASSY NOTE: If the reservoir cap has contaminations, always rinse it with water. Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water. When performing steps (a) and (b) on the following page, keep the tester at an angle of over 30° above the horizontal. Using a radiator cap tester, slowly pump the tester and check that air is being released from the vacuum valve. Pump speed: 1 push every 3 seconds or more NOTE: Push the pump at a constant speed. If air is not coming from the vacuum valve, replace the reservoir cap. Pump the tester and measure the relief valve opening pressure. Pump speed: 1 push within 1 second NOTE: The pump speed above should be followed for the first pump only. It will close the vacuum valve. Once the vacuum valve is closed, the pump speed can be reduced. Standard opening pressure: 93 to 123 kPa (0.95 to 1.25 kgf/cm 2 , 13.5 to 17.8 psi) Minimum opening pressure: 78 kPa (0.8 to 1.25 kgf/cm 2 , 11.4 psi) HINT: Pay attention to the tester's maximum reading of the opening pressure. If the maximum reading is less than the minimum opening pressure above, replace the reservoir cap.