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4-16 COOLING SYSTEM
Radiator
Radiator Inspection
•
Remove the radiator (see Radiator and Radiator Fan Re-
moval).
•
Check the radiator core.
If there are obstructions to air flow, remove them.
If the corrugated fins [A] are deformed, carefully
straighten them.
If the air passages of the radiator core are blocked more
than 20% by unremovable obstructions or irreparably de-
formed fins, replace the radiator with a new one.
CAUTION
When cleaning the radiator with steam cleaner, be
careful of the following to prevent radiator damage:
Keep the steam gun [A] away more than 0.5 m (1.6
ft) [B] from the radiator core.
Hold the steam gun perpendicular [C] (not oblique
[D]) to the core surface.
Run the steam gun, following the core fin direction.
Radiator Cap Inspection
•
Remove the radiator cap (see Pressure Testing).
•
Check the condition of the bottom [A] and top [B] valve
seals and valve s pring [C].
If any one of them shows visible damage, replace the cap
with a new one.
•
Install the cap [A] on a cooling system pressure tester [B].
NOTE
○
Wet the cap sealing surfaces with water or coolant to
prevent pressure leaks.
•
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 hand
must remain within the same range at least 6 seconds.
Radiator Cap Relief Pressure
Standard: 93 ∼ 123 kPa (0.95 ∼ 1.25 kgf/cm², 14 ∼ 18
psi)
If the cap can not hold the specified pressure or if it holds
too much pressure, replace it with a new one.
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