If the concentration is above 3 units per gallon, do not
replace the service filter. Test the coolant at subsequent
oil drain intervals until the concentration is back under 3
units. When the concentration is back under 3 units, start
installing service filters at each oil change interval.
NOTE: Do not utilize the test kit to maintain minimum SCA
concentration levels, (i.e., 1.5 units).
NOTE: In some instances, the A or B reading can be high.
However, it is the combined reading that is important. So
always follow the chart.
Coolant Filter (1-06)
The correct coolant filter to be used is determined by the
total cooling system capacity and other operational fac-
tors.
Refer to Cooling System Specifications, for the correct
filter to use.
Removal
A manual shutoff valve is provided to prevent coolant
leakage while changing the coolant filter.
With the valve in the vertical position, the coolant flows
to and from the coolant filter. In the horizontal position,
the coolant flow is cut off to and from the coolant filter.
Above 3 Units
• Do Not Replace Service Filter
• Test at Every Oil Change
Section 1 - Cooling System Coolant Filter (1-06)
N14 Page 1-17
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