4-14 COOLING SYSTEM
Wet the top and bottom valve seals with water or coolant
to prevent pressure leaks.
Install the cap [A] on a cooling system pressure tester [B].
Watching the pressure gauge, slowly pump the pressure
tester to build up the pressure. The gauge hand must
remain within the relief pressure range in the table below
at least 6 seconds. Continue to pump the tester until the
relief valve opens, indicated by the gauge hand flicking
downward. The relief valve must open within the specified
Radiator Cap Relief Pressure
Standard: 112 ∼ 142 kPa (1.14 ∼ 1.45 kgf/cm², 16.2 ∼
If the cap cannot hold the pressure, or if the relief pressure
is too high or too low, replace the cap with a new one.
Filler Neck Inspection
Check the radiator filler neck for signs of damage.
Check the condition of the top and bottom sealing seats
[A] in the filler neck. They must be smooth and clean for
the radiator cap to function properly.
Water Hoses, Breather Hose Inspection
Refer to the Water Hoses and Connections Inspection in
the Periodic Maintenance chapter.
Water Hoses, Breather Hose Installation
Install the water hoses or breather hose being careful to
follow the performed bends (see Cable, Wire, and Hose
Routing section in the Appendix chapter). Avoid sharp
bending, kinking, flattening, or twisting.
Tighten the hose clamps securely.
Torque - Water Hose Clamp Screws: 1.5 N·m (0.15 kgf·m,