Lexus ES: Cooling System
On-vehicle Inspection
ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
CAUTION:
Do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
PROCEDURE
1. INSPECT FOR COOLANT LEAK
CAUTION:
Do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
(a) Remove the radiator cap sub-assembly.
| (b) Fill the radiator assembly with engine coolant, and then install a radiator cap tester. |
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(c) Warm up the engine.
(d) Pump the radiator cap tester to 122 kPa (1.2 kgf/cm2, 18 psi), and then check that the pressure does not drop.
- If the pressure drops, check the hoses, radiator assembly and engine water pump assembly for leaks.
- If there are no signs of external engine coolant leaks, check the heater core, cylinder block sub-assembly and cylinder head sub-assembly.
(e) Remove the radiator cap tester.
(f) Install the radiator cap sub-assembly.
2. INSPECT ENGINE COOLANT LEVEL IN RESERVOIR TANK
| (a) Check that the engine coolant level is between the L line and F line when the engine is cold. If the engine coolant level is low, check for leaks and add engine coolant to the F line. NOTICE: Do not substitute plain water for engine coolant. |
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3. INSPECT ENGINE COOLANT QUALITY
CAUTION:
Do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
(a) Remove the radiator cap sub-assembly.
(b) Check if there are any excessive deposits of rust or scale around the radiator cap sub-assembly and water filler hole. Also, the engine coolant should be free of oil.
If excessively dirty, replace the engine coolant.
(c) Install the radiator cap sub-assembly.
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Components
COMPONENTS ILLUSTRATION *A Type A *B Type B *1 FRONT WHEEL OPENING EXTENSION PAD LH *2 FRONT WHEEL OPENING EXTENSION PAD RH *3 NO. 1 ENGINE UNDER COVER - - N*m (kg
On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT CAUTION: Do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may b
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Installation
INSTALLATION PROCEDURE 1. INSTALL DRIVE MODE SELECT SWITCH (COMBINATION SWITCH ASSEMBLY) (a) Install the drive mode select switch (combination switch assembly) to the instrument cluster finish panel assembly with the 3 screws. (b) Engage the clamp to connect the wire harness to the instrument cluste
Parking Light/Daytime Running Light Circuit
DESCRIPTION Parking light function:
When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the headlight ECU sub-assembly and illuminates the parking lights.
Daytime running light function:
When the o
