MCi Crusader II 1989 Maintenance Manual page 209

Date
1-1-89 .
Page
6-10
MC-9 MAINTENANCE MANUAL
COOLANT RECOVERY SYSTEM (OPTION)
The automatic coolant recovery system limits the loss of
overflow coolant. Th1s 1s accomplished by a coolant recovery
tank w1th a capacity of six U.S. gallons (22.7 liters). The system
also includes a coolant pump with electrical controls (figure
6-10). a tell-tale light on the dash. and a tell-tale light and test
switch on the remote contra! box in t~e engine compartment.
Low coolant sensors 1n the surge tank are also used. in con-
1unct1on with the automatic pump controls.
Figure 6-10. Coolant Recovery System Pump.
OPERATION
When the battery sw,tcn ,s ON and tne cuoI21r,t
t"
t
1
1e surge
tank lat!s below a certain level. the coolant sensors activate the
pump and tell-tale lights. When activated. the pump automat1-
caI1y fills the cooling system from the recovery tank. and shuts
off wnen the system Is full The pump w,I1 not operate when the
recovery tank 1s empty
F,111ng the cooI1ng system Is accomplished through the rec-
overy tank. See figure 6-
11.
This eliminates the danger ol hot.
pressurized coolant as the recovery tank Is not pressurized.
Procedures for draining and 1111mg the cooling system are
detailed earl?er
in
this section
Figure 6-11. Coolant Fill Cap.
MAINTENANCE
At regular service intervals the operation of the tell-tale lights
and pump should be checked.
Push the Fill Bulb Test switch on the remote control box to
the BULB TEST position and ensure that both tell-tale lights
illuminate.
To check the pump. push the switch to the FILL position and
ensure that the pump operates.
During normal coach operation. 1f the tell-tale lights are on
and the pump is not running. the coolant level in the recovery
tank 1s low and snould be replenished.
DRAINING
To drain only the engine and related components close the
two gate valves and proceed as follows:
1. Turn the battery switch ON.
2. Remove the drain plugs at the radiator return line tee.
located below the engine water pump.
3. As the coolant drains below the sensor in the surge tank.
the LOW WATER telt-taie on the remote control box will come
on and the pump will start. When the recovery tank 1s drained.
the pump wilt shut off.
4. Turn the battery switch OFF.
5. Remove the drain plug from the central heat crossover
line. or on coaches equipped with a coolant filter. open the
drain cock at the filter.
6. Remove the drain plugs from the suction line. the engine
011 cooler. and the air compressor.
NOTE: Descriptions and locations of cool-
ing system drain points were outlined pre-
viously in this section. See figures 6-6 and
6-7.
To drain the entire cooling system the gate valves should be
left open and the bleeder valve on the driver's heater core
should be opened after the coolant has drained.
CAUTION: After draining the cooling sys-
tem attach a suitable tag to the steering
wheel indicating·that the cooling system is
dry.
REFILLING
On coaches equipped with the coolant recovery system. the
cooling system filler tube 1s located beiow the remote control
panel In the engine compartment. See figure
6-11.
To fill the system. close all drain cocks and plugs. ensure that
the gate valves are open, 11 filling the entire system. and proceed
as follows:
1
Turn the battery switch ON. The LOW WATER tell-ta1e
light on the remote control box will come on. If it does not work.
check the light using the Fill Bulb Test switch
2. Add five gallons (18.9 !rters) of coolant to the recovery
tank. The pump will begin to operate. pumping coolant into the
system.
3. Open the petcock on the water bypass tube between the
engine thermostats. This will allow air to bleed as the system
fills. When coolant begins to flow. close the petcock.
4.
When the recovery tank has drained. the pump will shut
off