文档介绍：1NZ-FE COOLING – COOLING SYSTEM CO–1
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 to
run if the engine coolant temperature is high and/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 ( kgf/cm2, psi),
then check that the pressure does not drop.
If the pressure drops, check the hoses, radiator CO
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.
A106594
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 anic 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