Operator`s manual

Cooling System 47
Standard Antifreeze Testing
General
Coolant SCA level must be tested at least
twice per year and whenever coolant loss
occurs. For maximum coolant system
efficiency, test the system every 25,000 to
30,000 miles (40,000 to 56,000 km),
depending on the oil change interval,
or every 1,000 hours or every 6 months
(whichever comes first).
Use liquid SCA and pre-charged coolant
filters to maintain a 1.5 to 3.0 SCA units
per gallon (0.4 to 0.8 units per liter)
concentration in the coolant.
W2003954
Depending on the make of antifreeze
or premixed coolant, SCAs are added
or have to be added to the system after
replacement. The SCA level will deplete
over time so it is important that the SCA
level is tested regularly and maintained.
The Volvo pre-charged filter is designed to
slowly release the SCA to help maintain the
recommended level during operation.
Note: Only change the filter after testing
shows depleted SCA in the cooling system.
DO NOT exceed the 3.0 units per gallon
(0.8 units per liter) concentration. Excessive
SCA concentration can form deposits on the
higher temperature surfaces of the cooling
system, reducing the engine’s heat transfer
characteristics. Reduced heat transfer
could cause cracking of the cylinder head
and other high temperature components.
Excessive SCA concentration can also result
in radiator tube blockage, overheating and/or
accelerated water pump seal wear.