Cooling System: Testing and Inspection

2ZR-FE COOLING: COOLING SYSTEM: ON-VEHICLE INSPECTION

CAUTION:
Be sure that the ignition is off if you work near the electric cooling fans or radiator grille. With the ignition on, the electric cooling fans may automatically start if the engine coolant temperature is high or the air conditioning is on.

1. CHECK COOLING SYSTEM FOR LEAKAGE

CAUTION:
To avoid the danger of being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator assembly.

(a) Fill the radiator assembly with engine coolant, then attach a radiator cap tester.





(b) Pump the tester to 137 kPa (1.4 kgf/cm2, 19.9 psi), then check that the pressure does not drop.

If the pressure drops, check the hoses, radiator assembly and water pump assembly for leakage. If there are no signs or traces of external engine coolant leakage, check the heater core, cylinder block and head.

2. INSPECT RESERVOIR TANK ENGINE COOLANT LEVEL

(a) The engine coolant should be between the LOW and FULL lines when the engine is cold.

HINT
If it is below the LOW line, check for leakage and add Toyota Super Long Life Coolant or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the FULL line.

3. INSPECT ENGINE COOLANT QUALITY

(a) Remove the radiator cap sub-assembly.

CAUTION:
To avoid the danger of being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator assembly.

(b) Check for excessive deposits of rust or scale around the radiator cap sub-assembly and radiator filler hole. The engine coolant should be free of oil.

If excessively dirty, replace the engine coolant.

(c) Reinstall the radiator cap sub-assembly.

4. INSPECT FINS FOR BLOCKAGE





(a) If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.

NOTICE:
* To avoid damaging the fins, the injection direction should be at right angles to the core surface.
* If the steam cleaner is too close to the core, there is a possibility of damaging the fins, so keep to the following injection distances.






* If the fins are bent, straighten them with a screwdriver or pliers.
* Do not expose electronic components to water.