4-16 COOLING SYSTEM
Radiator Cap Inspection
Check the condition of the top and bottom valve seals of
the radiator cap.
If any one of them shows visible damage, replace the cap.
Bottom Valve Seal [A]
Top Valve Seal [B]
Valve Spring [C]
Install the cap [A] on a cooling system pressure tester [B].
Wet the cap sealing surfaces with water or coolant to
prevent pressure leakage.
Watching the pressure gauge, pump the pressure tester
to build up the pressure until the relief valve opens: the
gauge needle flicks downward. Stop pumping and mea-
sure leak time at once. The relief valve must open within
the specified range in the table below and the gauge nee-
dle must remain within the same range at least 6 seconds.
Radiator Cap Relief Pressure
If the cap holds too much pressure or cannot hold the
specified pressure, replace it with a new one.
Radiator Filler Neck Inspection
Remove the radiator cap.
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.
123 kPa (0.95
17.8 psi) for 6 seconds