Volvo XC90 Owner's Manual page 191

09 Maintenance and service
Oils and fluids
09
Checking and topping up the coolant
When topping up the coolant, follow the in-
structions on the packaging. It is important
that the mixture of coolant concentrate and
water is correct for the prevailing weather
conditions. Never top up with water only. The
risk of freezing increases with both too little
and too much coolant concentrate.
IMPORTANT
Always use coolant with anti-corrosion agent
as recommended by Volvo. New cars are
filled with coolant that can withstand tem-
peratures down to approximately –35 °C.
See capacities on page 247.
190
Check the coolant regularly
The level should lie between the MIN and
MAX marks on the expansion tank. If the
system is not filled sufficiently, high local
temperatures could occur, causing a risk of
damage (cracks) to the cylinder head. Top up
the coolant when the level falls to the MIN
mark.
WARNING
The coolant may be very hot. If the coolant
requires topping up when the engine is at
operating temperature, unscrew the expan-
sion tank cap slowly to gently release the
overpressure.
NOTE
The engine must only be run with a well-
filled cooling system. High temperatures
can occur, causing a risk of damage
(cracks) to the cylinder head.
Checking and topping up the brake
and clutch fluid
The brake and clutch fluid have a common
1
reservoir . The fluid level must be between
the MIN and MAX marks. Check the level
regularly. Change the brake fluid every other
year or at every other regular service.
See the capacities and recommended fluid
grade on page 247.
The fluid should be changed annually on cars
driven in conditions requiring hard, frequent
braking, such as driving in mountains or
tropical climates with high humidity.
1
Location dependent on whether car is left or
right-hand drive.