Engine Cooling System (Service Information): Overview Lexus CT I

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1. DRAIN COOLANT (for Engine) NOTE: Do not remove the reserve tank cap 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. HINT: Collect the coolant in a container and dispose of it according to the local regulations. Remove the reserve tank cap and drain the coolant. TEXT IN ILLUSTRATION *1 Reserve Tank Cap *2 Radiator Drain Cock Plug
2. ADD COOLANT (for Engine) Tighten the radiator drain cock plug. Add coolant to B line of the reserve tank. TEXT IN ILLUSTRATION *1 B Line Standard Capacity Item Capacity Engine coolant w/ Exhaust Heat Recirculation System: 6.9 liters (7.3 US qts, 6.1 lmp. qts) w/o Exhaust Heat Recirculation System: 6.5 liters (6.9 US qts, 5.7 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. Squeeze the 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-568589-S23460353802013072300000) . Install the reserve tank cap. 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. (•1) HINT: The thermostat opening timing can be confirmed by squeezing the inlet 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. Stop the engine and wait until the coolant cools down. Then if the coolant level is below the low line, add coolant so that the level will be between the full and low lines. (•2) Repeat the steps from (•1) to (•2) until the coolant level of the reserve tank remains above the low line. After the engine has cooled down, check that the coolant level is between the 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.
3. INSPECT FOR COOLANT LEAK (for Engine) . Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/ct/i-2010-2014/remont/cooling-system-mechanical/#engine-cooling-system-2zr-fxe-inspection)

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1. REMOVE RADIATOR SUPPORT OPENING COVER . Refer to «REMOVAL - Step 1»(ref-568749-S05660375792013072300000)
2. REMOVE INLET AIR CLEANER ASSEMBLY . Refer to «REMOVAL - Step 5»(ref-568740-S42718219202013072300000)
3. DRAIN COOLANT (for Engine) See step 1
4. REMOVE ENGINE WATER PUMP ASSEMBLY Disconnect the connector from the engine water pump assembly. Remove the 5 bolts and engine water pump assembly from the timing chain cover. Remove the gasket from the engine water pump assembly.

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1. INSTALL ENGINE WATER PUMP ASSEMBLY Install a new gasket. HINT: Be sure to clean the contact surfaces. Install the engine water pump assembly to the timing chain cover with the 5 bolts. Bolt A Torque: 26 N*m (260 kgf*cm, 19 ft.*lbf) Bolt B Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Bolt Length Item Length Bolt A 35 mm (1.38 in.) Bolt B 18 mm (0.709 in.) Connect the connector to the engine water pump assembly.
2. INSTALL INLET AIR CLEANER ASSEMBLY . Refer to «INSTALLATION - Step 4»(ref-568740-S13944941502013072300000)
3. ADD COOLANT (for Engine) See step 2
4. INSPECT FOR COOLANT LEAK (for Engine) . Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/ct/i-2010-2014/remont/cooling-system-mechanical/#engine-cooling-system-2zr-fxe-inspection)
5. INSTALL RADIATOR SUPPORT OPENING COVER . Refer to «INSTALLATION - Step 3»(ref-568749-S42200779382013072300000)

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1. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 20»(/lexus/ct/i-2010-2014/remont/mechanical/#engine-mechanical-2zr-fxe-service-information)
2. DRAIN COOLANT (for Engine) See step 1
3. REMOVE ENGINE COOLANT TEMPERATURE SENSOR Disconnect the connector. Using a union nut wrench (19 mm), remove the engine coolant temperature sensor. NOTE: Do not apply any excessive force to the heater pipe when removing the engine coolant temperature sensor.

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1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Measure the resistance according to the value(s) in the table below. Standard Resistance Condition Specified Condition Approximately 20°C (68°F) 2.32 to 2.59 kohms Approximately 80°C (176°F) 0.310 to 0.326 kohms NOTE: When checking the engine coolant temperature sensor in water, keep the terminals dry. After the check, dry the engine coolant temperature sensor. If the resistance is not as specified, replace the engine coolant temperature sensor.

See also:
• ON-VEHICLE INSPECTION - Step 1
• REMOVAL - Step 20
• REMOVAL
• REMOVAL - Step 1
• REMOVAL - Step 2
• REMOVAL - Step 2
• REMOVAL - Step 13