46 Cooling System
Testing Procedure
Run the engine to operating temperature.
After the engine has reached operating tem-
perature, move the heater controls (on dash
and in sleeper) to full heat and run the en-
gine for 10 more minutes.
WARNING
Hot engine. Keep yourself clear of all
hot engine parts and/or fluids. A hot en-
gine and/or can cause serious burns.
Shut off the engine and allow it to cool.
Test the coolant with the test kit. Depending
on the concentration of SCA in the coolant:
•
If the SCA concentration is below 1.5
units per gallon (0.4 units per liter),
replace the coolant filter and calculate
the required units of SCA to reach the
desired SCA level. See example.
•
Between 1.5 and 3.0 units per gallon
(0.4 and 0.8 units per liter), replace
the coolant filter, P/N 3945411.
•
Above 3.0 units per gallon (0.8 units
per liter). Do not replace the coolant
filter until further testing at the next
oil change indicates that the level has
dropped below 2.3 units per gallon
(0.6 units per liter).
CAUTION
SCA levels deplete during normal opera-
tion and when coolant is added because
of low coolant level. SCA levels should
be maintained at the middle of the rec-
ommended interval.
Unit per gallon:
1.5 LOW - 2.3 MID - 3.0 HIGH
Units per liter:
0.4 LOW - 0.6 MID - 0.8 HIGH
EXAMPLE
Step 1 Desired
SCA level
2.3 units
per gallon
recom-
mended
level 1.5-
3.0 units
per gallon
Subtract: -
Coolant
test results
1.5 units
per gallon
=
Required
SCA per
gallon
increase
0.8 units
per gallon
Step 2
Cooling
system
capacity
13 US
gallons
Use actual
system
capacity
Multiply
by:
x
Required
SCA per
gallon
increase
0.8 units
per gallon
=
Total SCA
units
required
10.4 units
(11 units)
round up
to nearest
whole
number
FIND-
INGS
Use one (8 unit) filter, P/N 3945411 and
3 units liquid SCA
See “Cooling System Capacity*” page
167 for system quantities.
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