Toyota 2013 Avalon Hybrid Owner's Manual page 332

Coolant
The coolant level is satisfactory if it is between the full and low lines
on the reservoir when the hybrid system is cold.
■
Engine coolant reservoir
1
Reservoir cap
2
"F" line
3
"L" line
If the level is on or below the "L"
line, add coolant up to the "F"
line. (→P. 444)
■
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. 444)
AVALON_HV_U (OM41451U)
6-3. Do-it-yourself maintenance
353
6