4-12 COOLING SYSTEM
Radiator and Radiator Fan
Radiator Inspection
•
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 irreparable de-
formed fins, replace the radiator.
Radiator Cleaning
•
Refer to the Radiator Cleaning in the Periodic Mainte-
nance chapter.
Radiator Cap Inspection
•
Check the condition of the radiator cap valve seals [A] and
valve spring [B].
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 leakage.
•
Watching the pressure gauge, slowly pump the pressure
tester to build up the pressure. The gauge pointer 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 pointer flicking
downward. The relief valve must open within the specified
range.
Radiator Cap Relief Pressure
Standard:
93
∼ 123 kPa (0.95 ∼ 1.25 kgf/cm², 13
∼ 18 psi)
If the cap cannot hold the specified pressure, or if it holds
too much pressure, replace the cap.