Volvo XC90 Owner's Manual page 219

Checking and topping up the coolant
When topping up the coolant, follow the
instructions 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 with-
stand temperatures down to approxi-
mately ca -35 °C.
See capacities on page 294.
Check the coolant regularly
The level must 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
Coolant can be very hot. If the coolant
requires topping up when the engine is at
operating temperature, unscrew the
expansion tank cap slowly to gently
release the overpressure.
09 Maintenance and service
IMPORTANT
•
A high content of chlorine, chlorides
and other salts may cause corrosion in
the cooling system.
•
Always use coolant with anti-corrosion
agent as recommended by Volvo.
•
Ensure that the coolant mixture is 50%
water and 50% coolant.
•
Mix the coolant with approved quality
tap water. In the event of any doubt
about water quality, used ready-mixed
coolant in accordance with Volvo rec-
ommendations.
•
When changing coolant/replacing
cooling system components, flush the
cooling system clean with approved
quality tap water or flush with ready-
mixed coolant.
•
The engine must only be run with a
well-filled cooling system. Otherwise,
temperatures that are too high may
occur resulting in the risk of damage
(cracks) in the cylinder head.
For capacities and for standards regarding
water quality, see the table under Fluids and
lubricants on page 294.
Oils and fluids
09
217