MCi Crusader II 1989 Maintenance Manual page 206

Date
1-1-89
Page
6-7
MC-9 MAINTENANCE MANUAL
JRAINING COOLING SYSTEM
The cooling ·system may be completely or partially drained
by using the following procedures.
CAUTION: After draining the cooling sys-
tem attach a suitable tag to the steering
wheel indicating that the cooling system is
dry.
To dram the entire system leave the two gate valves open
and proceed with the following: (See figures 6-5. 6-6 and 6-
7c)
1
Depress the vent button at the rad1ato_r filler cap.
2. Open the filler cap.
3. Remove the dram plug at the radiator return line tee.
located below the engine water pump.
4. When the coolant has drained. open the bleeder valve on
the driver's heater core.
5 Remove the drain plugs from the suction line. the engine
oil cooler. and the air compressor.
To dram only the engine and related components. close lhe
two gate valves and proceed as follows:
1 Depress the vent button on the radiator filler cap.
2. Open the radiator filler cap to allow air into the system as
the coolarit dra,ns.
3 Remove the dram plug at the radiator return line tee.
located below the water pump.
4. Remove the drain plugs from the central heat crossover
line. or on coaches equipped with a coolant filter. open the
drain cock on the filter.
5 Remove the drain plugs from the suction lirie. the engine
oil cooler. and the air compressor.
Figure 6-6. Drain Plugs and Coolant Filter.