Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000261AN
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: G16E-GTS (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION; 2023 - 2025 MY GR Corolla [09/2022 -        ]

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Do not remove the reserve tank cap, radiator cap sub-assembly or radiator drain cock plug 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 reserve tank cap, radiator cap sub-assembly or radiator drain cock plug 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 reserve tank cap.

(b) Fill the radiator reserve tank assembly with engine coolant, and then install a radiator cap tester.

*a

Radiator Cap Tester

(c) Warm up the engine.

(d) Pump the radiator cap tester to 123 kPa (1.3 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 reserve tank cap.

2. INSPECT RADIATOR RESERVE TANK ENGINE COOLANT LEVEL

(a) Check that the engine coolant level is between the LOW line and FULL line when the engine is cold.

NOTICE:

Do not substitute plain water for engine coolant.

If the engine coolant level is low, check for leaks and add engine coolant to the FULL line.

*a

FULL Line

*b

LOW Line

3. INSPECT ENGINE COOLANT QUALITY

CAUTION:

Do not remove the reserve tank cap, radiator cap sub-assembly or radiator drain cock plug 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 reserve tank cap.

(b) Check that there are no excessive deposits of rust or scale around the reserve tank cap and engine coolant hole. Also, the engine coolant should be free of oil.

If excessively dirty, clean the engine coolant passage and replace the engine coolant.

(c) Install the reserve tank cap.