Cooling System, Cleaning

Cooling System Flush Procedure

Radiator Installed

To remove rust, sludge and other foreign material from the engine cooling system, use Premium Cooling System Flush D6AZ-19A503-AA or equivalent meeting Ford specification ESR-M14P7-A that is safe for use with aluminum radiators (8005) . Remove the water thermostat (8575) prior to pressure flushing. This cleaning restores cooling efficiency and helps prevent overheating. A pulsating or reversed direction of flushing water will loosen sediment more quickly than a steady flow in the normal coolant flow direction. In severe cases where cleaning solvents will not properly clean the cooling system for efficient operation, it will be necessary to use the pressure flushing method using Rotunda Cooling System Flusher 106-00010 or equivalent. Dispose of old coolant and flushing water contaminated with antifreeze and cleaning chemicals in accordance with local, state and federal laws.

Radiator Removed

 CAUTION: Radiator internal pressure must not exceed 138 kPa (20psi). Damage may result.

1. Backflush radiator . With radiator upside down, position a high-pressure water hose in lower hose location and backflush.

2. Remove water outlet connection (8592) and water thermostat . Refer to Water Thermostat Removal.

3. Backflush engine. Position high-pressure hose into engine through water thermostat location and backflush engine.

Heater Core Back Flushing

All engine cooling system flushing and backflushing procedures must include a separate backflushing of the heater core (18476) , after the flushing or backflushing of the engine cooling system, to prevent engine cooling system particles from clogging the heater core tubes and reducing (or eliminating) coolant flow through the heater core . The heater core must be backflushed separately from the engine cooling system for proper backflush water flow direction through the heater core .

The correct heater core backflushing procedure is as follows:

1. Disconnect the heater core outlet heater hose from the water pump fitting and install a female garden hose-end fitting adapter in the end of the outlet heater hose. Secure with a hose clamp.

2. Connect the female garden hose end of the outlet heater hose to the male end of a water supply garden hose.

3. Disconnect the heater core inlet heater hose from the cylinder block fitting and allow to drain into a suitable container.

4. If a water valve is installed in the heater core inlet heater hose, check to be certain the water valve is open (no vacuum).

5. Turn the water supply valve on/off several times so that the surge action will help to dislodge larger stubborn particles from the heater core tubes. Allow full water pressure to flow for approximately five minutes.

6. If a water valve is installed in the heater core inlet heater hose, apply vacuum to the water valve vacuum motor to ensure proper operation of the water valve and proper closure with no water leakage. Replace the water valve if required.

7. Remove the hose clamp and female garden hose-end adapter from the end of the outlet heater hose and reconnect the outlet heater hose onto the water pump fitting.

8. Connect the inlet heater hose onto the cylinder block fitting.

9. Fill the engine cooling system, as described in this Section using the specified coolant mixture.

10. Test the system for proper heater performance with the specified engine cooling system conditions.