Cooling System Backflushing

Cooling System Backflushing

CAUTION: The heater core must be back flushed separately from the engine cooling system to prevent the engine cooling system particles from clogging the heater core tubes and reducing (or eliminating) coolant flow through the heater core.

CAUTION: Heater core internal pressure must not exceed 100 kPa (14.5 psi). Failure to follow this instruction may cause damage to the heater core.

NOTE: Cooling system backflushing should be carried out before the cooling system components are installed after the cooling system flushing procedure.

1. Disconnect the heater outlet coolant hose from the engine and connect the heater hose to a suitable hose pipe.
2. Disconnect the heater inlet coolant hose from the engine and allow the coolant to drain into a suitable container.
3. Turn the water supply valve to the hose ON and allow water pressure to flow through the heater core.
4. Allow water pressure to flow through the heater core for approximately five minutes.
5. Turn the water supply valve to the hose OFF and disconnect the hose pipe from the heater hose.
6. Connect the heater inlet coolant hose to the engine.
7. Connect the heater outlet coolant hose to the engine.
8. Fill the cooling system as described using a 50% mixture of Jaguar Premium Cooling System Fluid, or equivalent meeting Jaguar specification WSS M971344-D and 50% distilled water.
9. Test the system for correct heater performance with the specified engine cooling system conditions.