Cooling (Service Information): Overview Lexus HS I

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1. REMOVE NO. 1 ENGINE UNDER COVER
2. DRAIN COOLANT (for Engine) NOTE: Do not remove the reserve tank cap, oil cooler hose drain cock plug and radiator drain cock plug while the engine and radiator are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns. Loosen the radiator drain cock plug and drain the coolant. HINT: Collect the coolant in a container and dispose of it according to the local regulations. Loosen the oil cooler hose drain cock plug. TEXT IN ILLUSTRATION *1 Reserve Tank Cap *2 Oil Cooler Hose Drain Cock Plug *3 Radiator Drain Cock Plug
3. ADD COOLANT (for Engine) Tighten the radiator drain cock plug. Tighten the oil cooler hose drain cock plug. Remove the reserve tank cap. Add TOYOTA Super Long Life Coolant (SLLC) to the reserve tank filler opening. Standard Capacity Item Capacity Engine coolant 7.3 liters (7.7 US qts, 6.4 lmp. qts) HINT: TOYOTA vehicles are filled with TOYOTA SLLC at the factory. In order to avoid damage to the engine cooling system and other technical problems, only use TOYOTA SLLC or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, non-borate coolant with long-life hybrid organic acid technology (coolant with long-life hybrid organic acid technology is a combination of low phosphates and organic acids). NOTE: Never use water as a substitute for engine coolant. Remove the reserve tank cap and add coolant to B line of the reserve tank. TEXT IN ILLUSTRATION *1 B Line Squeeze the No. 1 and No. 2 radiator hoses several times by hand, and then check the level of the coolant. If the coolant level is low, add coolant. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-398089-S21258796492011051600000) . Install the reserve tank cap, and warm up the engine sufficiently. Bleed air from the cooling system. NOTE: Before starting the engine, turn the A/C switch off. Adjust the heater control to the maximum hot setting. Adjust the blower speed to the low setting. Warm up the engine until the thermostat opens. While the thermostat is open, allow the coolant to circulate for several minutes. HINT: The thermostat opening timing can be confirmed by squeezing the No. 2 radiator hose by hand, and sensing vibrations when the engine coolant starts to flow inside the hose. WARNING: When squeezing the radiator hose: Wear protective gloves. Be careful as the radiator hoses are hot. Keep your hands away from the radiator fans. After the engine is warmed up, let it idle for 7 minutes or more. Squeeze the No. 1 and No. 2 radiator hoses several times by hand to bleed air from the system. WARNING: When squeezing the radiator hose: Wear protective gloves. Be careful as the radiator hoses are hot. Keep your hands away from the radiator fans. After the engine has cooled down, check that the coolant level is between full and low lines. TEXT IN ILLUSTRATION *1 Full Line *2 Low Line If the coolant level is low, add coolant to the full line on the reserve tank.
4. INSPECT FOR COOLANT LEAK (for Engine) . Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/hs/i-2009-2012/remont/cooling-system-mechanical/#cooling-inspection)
5. INSTALL NO. 1 ENGINE UNDER COVER

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1. REMOVE V-RIBBED BELT HINT: Refer to «REMOVAL»(/lexus/hs/i-2009-2012/remont/mechanical/#engine-mechanical-service-information) .
2. REMOVE WATER PUMP PULLEY
3. INSPECT WATER PUMP ASSEMBLY Visually check the drain hole and air hole for coolant leakage. TEXT IN ILLUSTRATION *1 Air Hole *2 Drain Hole If leakage is found, replace the water pump assembly. Turn the pulley and check that the water pump bearing moves smoothly and does not make any noise. If necessary, replace the water pump assembly.
4. INSTALL WATER PUMP PULLEY
5. INSTALL V-RIBBED BELT HINT: Refer to «INSTALLATION»(/lexus/hs/i-2009-2012/remont/mechanical/#engine-mechanical-service-information) .

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1. REMOVE NO. 1 ENGINE COVER
2. DRAIN COOLANT (for Engine) See step 2
3. REMOVE V-RIBBED BELT HINT: Refer to «REMOVAL»(/lexus/hs/i-2009-2012/remont/mechanical/#engine-mechanical-service-information) .
4. REMOVE WATER PUMP PULLEY Using SST, remove the 4 bolts and water pump pulley. SST: 09960-10010 09962-01000 09963-00700
5. REMOVE WATER PUMP ASSEMBLY Remove the clamp of the crankshaft position sensor from the water pump. Disconnect the wire of the crankshaft position sensor from the clamp bracket. Remove the 4 bolts, 2 nuts and clamp bracket. TEXT IN ILLUSTRATION *1 Clamp Bracket Using a screwdriver, pry between the water pump and cylinder block, and then remove the water pump. HINT: Tape the screwdriver tip before use. NOTE: Be careful not to damage the contact surfaces of the water pump and cylinder block.

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1. INSTALL WATER PUMP ASSEMBLY Remove any old seal packing material from the contact surfaces. Apply a continuous line of seal packing as shown in the illustration. TEXT IN ILLUSTRATION *a Seal Diameter Seal packing Toyota Genuine Seal Packing 1282B, Three Bond 1282B or equivalent Standard seal diameter 2.2 to 2.5 mm (0.0866 to 0.984 in.) NOTE: Remove any oil from the contact surfaces. The parts must be set within 3 minutes after applying seal packing. Otherwise, the material must be removed and reapplied. Install the water pump and clamp bracket with the 4 bolts and 2 nuts. TEXT IN ILLUSTRATION *1 Clamp Bracket Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf) Install the wire of the crankshaft position sensor onto the clamp bracket. Install the clamp of the crankshaft position sensor onto the water pump.
2. INSTALL WATER PUMP PULLEY Using SST, install the water pump pulley with the 4 bolts. SST: 09960-10010 09962-01000 09963-00700 Torque: 26 N*m (265 kgf*cm, 19 ft.*lbf)
3. INSTALL V-RIBBED BELT HINT: Refer to «INSTALLATION»(/lexus/hs/i-2009-2012/remont/mechanical/#engine-mechanical-service-information) .
4. ADD COOLANT (for Engine) See step 3
5. INSPECT FOR COOLANT LEAK (for Engine) . Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/hs/i-2009-2012/remont/cooling-system-mechanical/#cooling-inspection)
6. INSTALL NO. 1 ENGINE COVER

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1. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 29»(/lexus/hs/i-2009-2012/remont/mechanical/#engine-mechanical-service-information)
2. REMOVE NO. 1 ENGINE UNDER COVER
3. DRAIN ENGINE COOLANT (for Engine) See step 2
4. REMOVE TEMPERATURE SWITCH Disconnect the temperature switch connector. Using a 19 mm deep socket wrench, remove the temperature switch. NOTE: Do not apply any excessive force to the heater pipe when removing the temperature switch.

See also:
• ON-VEHICLE INSPECTION - Step 1
• REMOVAL
• REMOVAL - Step 3
• REMOVAL - Step 9
• INSTALLATION - Step 2