Toyota Yaris: G16e-gts (cooling) / Cooling System

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (cooling) / 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 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 radiator cap sub-assembly.

2. INSPECT RADIATOR RESERVE TANK ENGINE COOLANT LEVEL

(a) Check that the engine coolant level is between the MIN line and MAX 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 MAX line.

*a

MAX Line

*b

MIN Line

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 that there are no excessive deposits of rust or scale around the radiator cap sub-assembly 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 radiator cap sub-assembly.

    Cooling Fan Circuit

    DESCRIPTION The ECM calculates an appropriate cooling fan speed based on the engine coolant temperature, air conditioning switch status, refrigerant pressure, engine speed and vehicle speed, and sends a signal to the cooling fan ECU (fan with motor assembly)...

    Radiator

    ..

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