Filling Cooling System - PREVOST H3-41 Maintenance Manual

SECTION 05b: X3 SERIES COOLING SYSTEM
4. Unscrew the surge tank pressure cap
counterclockwise, ¼ turn to let air enter the
system and permit the coolant to drain
completely from system.
5. Connect coolant extractor (Figure 7). Use
coolant extractor to drain the coolant from
the engine. An alternate method is to drain
the coolant into a suitable container using
the drain hose.
DANGER
Coolant is toxic; risk of poisoning. Do not drink
coolant. Use proper hand protection when
handling. Keep coolant out of reach of children
and animals. Failure
precautions can cause serious illness or
death.
FIGURE 7: EXTRACTING COOLANT
6. Open the radiator drain cock.
7. Remove the transmission oil cooler. Drain,
flush and inspect. Refer to Section 7,
"TRANSMISSION"
maintenance or preventive replacement.
16
PA1615 Maintenance Manual All Series
to follow these
05093
for oil cooler
|
Section 05b revised September 2016
CAUTION
Drain water pump completely before extended
storage to avoid
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
"Draining Heating System" in Section 22.

8. 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 radiator drain cock.
2. Open the shut-off valve on the coolant filter
mounting head.
3. Refill cooling system from the surge tank
filler cap inlet with the recommended
ethylene glycol-based antifreeze and water
solution of the required concentration using
the coolant extractor.
NOTE
Make sure the purge lines are properly
connected and not obstructed. The purge lines
(thermostat housing dome, radiator top tank,
transmission oil cooler or delivery line) are
required to ensure complete engine fill and
proper purging of air in the system.
NOTE
The coolant level should remain within two
inches of the surge tank filler neck.
4. Install the filler and pressure cap, then start
the engine and run it at fast idle until
reaching normal
Check for leaks.
possible water pump
operating temperature.