CAUTION: The cooling system normally operates at 97-124 kPa (14-18 psi) pressure. Exceeding this pres-
sure may damage the radiator or hoses.
Allow the radiator to fill with water. When radiator is filled, apply air in short blasts allowing radiator to refill between
blasts. Continue this reverse flushing until clean water flows out through rear of radiator cooling tube passages. For
more information, refer to operating instructions supplied with flushing equipment. Have radiator cleaned more
extensively by a radiator repair shop.
REVERSE FLUSHING ENGINE
Drain the cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE). Remove the thermostat housing
and thermostat. Install the thermostat housing. Disconnect the radiator upper hose from the radiator and attach the
flushing gun to the hose. Disconnect the radiator lower hose from the water pump. Attach a lead away hose to the
water pump inlet fitting.
CAUTION: Be sure that the heater control valve is closed (heat off). This is done to prevent coolant flow
with scale and other deposits from entering the heater core.
Connect the water supply hose and air supply hose to the flushing gun. Allow the engine to fill with water. When the
engine is filled, apply air in short blasts, allowing the system to fill between air blasts. Continue until clean water
flows through the lead away hose. For more information, refer to operating instructions supplied with flushing equip-
ment.
Remove the lead away hose, flushing gun, water supply hose and air supply hose. Remove the thermostat housing
(Refer to 7 - COOLING/ENGINE/ENGINE COOLANT THERMOSTAT - REMOVAL). Install the thermostat and hous-
ing with a replacement gasket (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT THERMOSTAT - INSTALLA-
TION). Connect the radiator hoses. Refill the cooling system with the correct antifreeze/water mixture (Refer to 7 -
COOLING - STANDARD PROCEDURE).
7 - 14
COOLING
WK