CO0WR--01
Z00570
Radiator Cap Tester
30 ˚ or More
Radiator Cap
B09013
Radiator Cap
Tester
--COOLING RADIATOR
CO--15
ON--VEHICLE INSPECTION
1. REMOVE RADIATOR 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 RADIATOR CAP
NOTICE:
S
SS
S
If the radiator cap has contaminations, always rinse
it with water.
S
SS
S
Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.
S
SS
S When performing steps (a) and (b) below, keep the
tester at an angle of over 30˚ above the horizontal.
(a) Using a radiator cap tester, slowly pump the tester and
check that air is coming form the 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 -- 125 kPa (0.95 -- 1.25 kgf/cm
2
, 10.7 -- 14. 9psi)
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) Pumpitto118kPa(1.2kgf/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 is found, check the heater core,
cylinder block and head.
4. REINSTALL RADIATOR CAP
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