Step 1 - Coolant Level, Checking:
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-- When the engine is cold, check the coolant level in the coolant expansion tank based on the container markings -image-.
-- If the coolant level is too low, fill the missing amount in the required mixture ratio. Refer to COOLANT, FILLING .
-- If there is a loss of fluid not due to normal use, first determine the cause with a leak test. Refer to COOLING SYSTEM, CHECKING FOR LEAKS - CYNB , or COOLING SYSTEM, CHECKING FOR LEAKS - CTGE, CEUC , or COOLING SYSTEM, CHECKING FOR LEAKS - CPNB , or COOLING SYSTEM, CHECKING FOR LEAKS - CREC, CREH , or COOLING SYSTEM, CHECKING FOR LEAKS - [FOR TRANSMISSION(S) 0B5, 0CK] [FOR ENGINE(S) CYNB] .