Coolant Level Check; Radiator Cap Condition - Isuzu 4BG1 Instruction Manual

(3) Coolant Level Check
1) Remove the radiator filler cap, and check the coolant level as
well as the degrees of fouling.
Proper coolant level is about 10 mm higher from the radiator
core top.
2) Use clean drinking water as coolant. When an anti-freeze
solution is required, keep to the specified mixing ratio.
(4) Radiator Cap Condition
After the replenishment of the coolant, install the radiator cap.
Make sure the cap is securely installed.
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