Section 05: COOLING SYSTEM
PA1553
10
CAUTION
Drain water pump completely before extended
storage to avoid possible water pump
damage.
If freezing weather is anticipated and the
engine is not protected with antifreeze, drain
the cooling system completely when vehicle is
not in use. Trapped water in the cylinder
block, radiator or other components may
freeze and expand resulting in damages.
Leave the drain plugs open until the cooling
system can be filled with coolant fluid. Do not
run engine with cooling system empty.
To drain the entire system, do the previous
steps while maintaining the shutoff valves in the
open position; then follow the procedure under
“11.1.1 or 11.2.1 Draining Heating System” in
Section 22.
6. FILLING COOLING SYSTEM
If only the engine and related components were
drained, maintain the two heater line shutoff
valves in their closed position, then proceed as
follows.
1. Close all drain cocks. Refer to draining
procedure for the location of draining points.
2. Refill cooling system from the surge tank
filler cap inlet with a recommended ethylene
glycol-based antifreeze and water solution
of the required concentration. Add Detroit
Diesel selected product cooling system
inhibitors (if required).
NOTE
The coolant level should remain within two
inches of the surge tank filler neck.
NOTE
Make sure the vent line at top of thermostat
housing is properly connected and not
obstructed. The vent line (thermostat housing
dome to radiator top tank) is required to
ensure complete engine fill and proper
venting of air in the system.
3. Install the filler and pressure caps, then start
the engine and run it at fast idle until
reaching normal operating temperature.
Check for leaks.
NOTE
If for any reason, the coolant level drops
below the surge tank level probe, the Check
Engine light will flash
4. Stop engine and allow cooling.
5. Open the two heater line shutoff valves,
check the coolant level in the surge tank,
and then add as required.
CAUTION
Never pour cold coolant into a hot engine.
The sudden change in temperature may crack
the cylinder head or block.
If the entire system has been drained, redo the
previous steps while maintaining the two heater
line shutoff valves in the "Open" position. With
engine running, activate the driver's and central
heating systems to permit coolant circulation.
Complete the procedure by bleeding the heater
cores as explained in Section 22, under “11.1.3
Bleeding Heating System”.
7. FLUSHING
If the cooling system is contaminated, flush the
cooling system as follows:
1. Drain the coolant from the engine.
2. Refill with clean water.
CAUTION
If the engine is hot, fill slowly to prevent rapid
cooling and distortion of the engine castings.
3. To thoroughly circulate the water, start and
run the engine for 15 minutes after the
thermostats have opened.
4. Fully drain system.
5. Refill with clean water and operate for 15
minutes after the thermostats have opened.
6. Stop engine and allow cooling.
7. Fully drain system.
Vehicles without coolant filters:
Fill with a 50/50-antifreeze/water solution
and add required inhibitors.
Vehicles with coolant filters:
To Next Page
Loading...
Need help?
General
