Honda 2007 Civic Hatchback Owner's Manual page 308

Diesel models
EXPANSION TANK
MIN LINE
On Diesel models
The coolant level in the expansion
tank should be checked only when
the engine and the cooling system
are cold. Make sure it is between the
MAX and MIN lines. If it is below
the MIN line, see Adding Engine
Coolant on page 374 .
Refer to
Checks
about checking other items on your
vehicle.
MAX LINE
Owner's Maintenance
on page 356 for information
Service Station Procedures
Before Driving
305