On-Vehicle Inspection [12/2021 - ]: Procedure

INSPECT ENGINE COOLANT LEVEL IN RESERVE TANK

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.

NOTE:

Do not substitute plain water for engine coolant.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	F Line
*b	L Line

INSPECT ENGINE COOLANT QUALITY

WARNING:

Do not remove the reserve tank cap or 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.

Remove the reserve tank cap.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check if there are any 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, replace the engine coolant.
Install the reserve tank cap.

INSPECT FOR COOLANT LEAK

WARNING:

Do not remove the reserve tank cap or 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.

Remove the reserve tank cap.

Fill the radiator assembly with engine coolant, and then install a radiator cap tester.

*a	Radiator Cap Tester

Warm up the engine.
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.
Remove the radiator cap tester.
Install the reserve tank cap.