Engine Coolant Reservoir; Power Control Unit Coolant Reservoir; Coolant Selection; If The Coolant Level Drops Within A Short Time Of Replenishing - Toyota RAV4 Hybrid 2018 Service Manual

496
7-3. Do-it-yourself maintenance
Coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the hybrid system is cold.
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Engine coolant reservoir

1
Reservoir cap
2
"FULL" line
3
"LOW" line
If the level is on or below the
"LOW" line, add coolant up to
the "FULL" line. (→P. 602)
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Power control unit coolant reservoir

1
Reservoir cap
2
"FULL" line
3
"LOW" line
If the level is on or below the
"LOW" line, add coolant up to
the "FULL" line. (→P. 602)
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Coolant selection

Only use "Toyota Super Long Life Coolant" or a similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with
long-life hybrid organic acid technology.
U.S.A.:
"Toyota Super Long Life Coolant" is a mixture of 50% coolant and 50%
deionized water. (Minimum temperature: -31°F [-35°C])
Canada:
"Toyota Super Long Life Coolant" is a mixture of 55% coolant and 45%
deionized water. (Minimum temperature: -44°F [-42°C])
For more details about coolant, contact your Toyota dealer.
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If the coolant level drops within a short time of replenishing

Visually check the radiator, hoses, engine/power control unit coolant reservoir
cap, drain cock and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
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