Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HBFB
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 11/2022]
Title: 2ZR-FAE (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION; 2020 - 2023 MY Corolla [01/2019 - 11/2022]

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Do not remove the reserve tank cap and air release valve 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 and air release valve 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) Add engine coolant to the FULL line of the radiator reserve tank assembly.

*a

Radiator Cap Tester

(c) Install a radiator cap tester.

(d) Warm up the engine.

(e) 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.

(f) Remove the radiator cap tester.

(g) 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.

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

NOTICE:

  • Do not substitute plain water for engine coolant.
  • The coolant levels in the compartments inside the radiator reserve tank assembly may differ, but this is not a malfunction.

*a

FULL Line

*b

LOW Line

3. INSPECT ENGINE COOLANT QUALITY

CAUTION:

Do not remove the reserve tank cap and air release valve 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 water filler 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.