PREVOST X3-45 COMMUTER User Manual

SECTION 05: COOLING SYSTEM
18
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
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
“Bleeding Heating System”.
9. 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.
8. Refill with a 50/50-antifreeze/water solution.
Replace coolant filter as per the Lubrication
and Servicing Schedule in section 24 if
required.
Dispose of spent fluids in an environmentally
responsible manner according to regulations in
effect in your area.
MAINTENANCE
COOLING SYSTEM CAPACITY Including
heating system (approximation):
27.5 US gal (104 liters).
9.1 COOLING SYSTEM DESCALERS
If the engine overheats and the water pump,
coolant level and thermostat operation have
been found to be satisfactory, it may be
necessary to flush and de-scale the cooling
system.
1. Drain the coolant from the engine.
2. Fill system with clean water.
3. Add the required amount of a reputable
commercially available de-scaling product
(aluminum & copper compatible). It is
important that product directions be
thoroughly read and followed regarding
duration of the treatment, temperature and
product mix ratio.
CAUTION
Only use de-
scaling products sold by a
reputable manufacturer,
product must be
aluminum and copper compatible and must be
safe for rubber hoses and gaskets.
Some de-scaling products will require the use
of a neutralizing agent before coolant system
refill
Carefully follow manufacturer’s
directions to
avoid cooling system damage when using
descaling products.
Never use “home-
brewed” descaling solution
containing
caustic or acid products not
intended for cooling system descaling or
having unknown active product concentration.
4. Drain descaling solution from the cooling
system.
5. Refill with clean water and carefully rinse the
cooling system to completely evacuate all
remaining descaling solution.
6. On heavily contaminated system, reverse
flush the cooling system to prevent remaining
dirt and scale deposits from clogging the
radiator tubes or being forced through the
water pump (refer to paragraph 9.2 Reverse
Flushing below).
7. Flush the system.
8. Refill system with appropriate coolant.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in