303-03-172
Engine Cooling
303-03-172
GENERAL PROCEDURES
E1690 EN
07/2001 2002 Bantam
Heater Core Back flushing
CAUTION: The heater core must be back
flushed separately from the engine cool-
ing system for proper back flush water
flow direction through the heater core.
All engine cooling system flushing and
back flushing procedures must include
a separate back flushing of the heater or
A/C system heater core after the flush-
ing or back flushing of the engine cool-
ing system to prevent the engine cool-
ing system particles from clogging the
heater core tubes and reducing (or
eliminating) coolant flow through the
heater core.
1. Disconnect the outlet heater water hose
from the engine and install a female garden
hose and fitting adapter in the end of the
heater outlet water hose. Secure with a
hose clamp.
2. Connect the female hose end of the heater
outlet water hose to the male end of a water
supply garden hose.
3. Disconnect the heater inlet water hose from
the engine and allow it to drain into a
suitable container.
4. Turn the water supply valve ON and OFF
several times so that the surge action will
help to dislodge larger, stubborn particles
from the heater core tubes. Allow water
pressure to flow for approximately five
minutes.
5. Remove the hose clamp and female garden
hose end adapter from the heater outlet
water hose and reconnect the heater outlet
water hose onto the engine.
6. Connect the heater inlet water hose onto
the engine.
7. Fill the cooling system as described, using
a 50/50 mixture of L405F antifreeze and
water.
8. Test the system for proper heater
performance with the specified engine
cooling system conditions.
