CO077--01
Z00570
Radiator Cap Tester
Radiator Cap
30
˚
or More
A01388
Radiator Cap Tester
CO--12
--
COOLING
RADIATOR
ON -- V E HI CL E I NS P E CT I O N
1 . RE MO V E RADI ATO R CAP
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
2. INSPECT RADI ATO R CAP
NOTICE:
SSSS
If the radiator cap contaminations, always rinse it
with water.
SSSS
When performing steps (a) and (b) below, keep the ra-
diator pump tester at an angle of over 30
˚
above the
horizotal.
SSSS
Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.
(a)
Using a radiator cap tester, slowly pump the tester and
check that air is coming from vacuum valve.
Pump speed: 1 push/(3 seconds or more)
NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b)
Pump the tester and measure the relief valve opening
pressure.
Pump speed: 1 push within 1 second
NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be re-
duced.
Standard opening pressure:
93 -- 123 kPa (0.95 -- 1.25 kgf/cm
2
, 13.1 -- 18.2 psi)
Minimum opening pressure:
59 kPa (0.6 kgf/cm
2
, 8.5 psi)
HINT:
Use the tester’s maximum reading as the opening pressure.
If the opening pressure is less than minimum, replace the radia-
tor cap.
3. INSPECT COOLING SYSTEM FOR LEAKS
(a)
Fill the radiator with coolant and attach a radiator cap tes-
ter.
(b)
Warm up the engine.
(c)
Pump it to 118 kPa (1.2 kgf/cm
2
, 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 head.
4 . RE I NS TALL RADI ATO R CAP
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Pages From Supplement
3RZ-F,3RZ-FE
