CO-12
COOLING SYSTEM Radiator
RADIATOR
CLEANING OF RADIATOR
Using water or a steam cleaner, remove any mud and dirt
from the radiator core.
NOTICE: If using a high pressure type cleaner, be
careful not to deform the fins of the radiator core. If
the cleaner nozzle pressure is 30-35 kg/cm
2
(427-498
psi, 2,942-3,432 kPa), keep a distance of at least
40-50 cm (15.75-19.69 in.) between the radiator core
and cleaner nozzle.
INSPECTION OF RADIATOR
1. INSPECT RADIATOR CAP
Using a radiator cap tester, pump the tester and measure
the relief valve opening pressure.
Standard opening pressure:
0.75-1.05 kg/cm
2
(10.7-14.9 psi, 74-103 kPa)
Minimum opening pressure:
0.6 kg/cm
2
(8.5 psi, 59 kPa)
If the opening pressure is less than minimum, replace the
radiator cap.
2. INSPECT COOLING SYSTEM FOR LEAKS
(a) Fill the radiator with coolant and attach a radiator cap
tester.
(b) Warm up the engine.
(c) Pump it to 1.2 kg/cm
2
(17.1 psi, 118 kPa), check that
pressure does not drop.
If the pressure drops, check for leaks the hoses, radiator or
water pump. If no external leaks are found, check the heater
core, cylinder block and head.
Radiator Cap Tester
Radiator Cap
Radiator Cap Tester
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