PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 22: HEATING AND AIR CONDITIONING
PA1564
41
FIGURE 43: HEATER LINE SHUTOFF VALVES
05070
On XLII-45 vehicles , the valves are located in
engine compartment. One is on the L.H. side of
compartment in front of the radiator and the other
valve is located under the radiator fan gearbox
(Fig. 44).
FIGURE 44: HEATER LINE SHUT-OFF VALVES
05067
c) The main heater core drain cock is located
in the evaporator compartment. To
access, open the baggage compartment
forward of the evaporator compartment.
An access door held shut by three
retaining tabs is located in the wall
separating the baggage compartment and
the evaporator compartment (Fig. 15).
WARNING
Before proceeding with the following step,
check that coolant has cooled down.
d) Open drain cock in bottom of heater core,
you can unfasten a hose connection on
top of heater core (Fig. 45) in order to
allow air to enter while draining.
FIGURE 45: CABIN HVAC UNIT DRAIN COCK
22128
11.1.2 Filling Heating System
1. Ensure that the drain hose is reconnected
and the manual vent and drain cock are
closed.
2. Open the surge tank filler cap and slowly fill
the system to level of filler neck.
3. After initial filling, the water valves should
be open and the water recirculating pump
should be energized to assist in circulating
coolant through the heating system. To
perform this operation, start the engine,
switch on the HVAC control module, both
driver’s and cabin (passenger) areas, and
set temperature to their maximum positions
in order to request the heating mode in
each of these areas.
4. When coolant level drops below the surge
tank filler neck, slowly fill the system to level
of filler neck.
5. Once the level has been stabilized, replace
cap.
11.1.3 Bleeding Heating System
Whenever the heating system has been drained
and refilled, or the system has run low on
coolant and coolant has been added, it is
necessary to bleed air from heating system.
Locate the manual vent illustrated in Figure 41
and open momentarily until no air escapes from
the line.