Toyota 3S-GE Repair Manual page 340

E6326 ENGINE —
COOLING SYSTEM
- 3.
Radiator Cap Tester (3)
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4.
INSPECT COOLING SYSTEM FOR LEAKS
Fill the radiator with coolant, and attach a radiator cap
tester to the water filler.
Warm up the engine.
Pump it to 118 kPa (1.2 kgf/cm', 17.1 psi), and check
that the pressure does not drop.
If the pressure drops, check the hoses, radiator or
water pump for leaks. If no external leaks are found,
check the heater core, cylinder block and cylinder
head.
REINSTALL RADIATOR CAP