Lexus RX 450h 2012 Owner's Manual page 520

Coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the engine and hybrid system are cold.
Engine coolant reservoir
4-3. Do-it-yourself maintenance
Reservoir cap
"FULL" line
"LOW" line
If the level is on or below the
"LOW" line, add coolant up to the
"FULL" line. (→P. 670)
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