CAUTION: The heater core must be counter-flushed separately from the engine cooling system. This is necessary to ensure that the flush water flows through the heater core correctly. All engine cooling system flushing and backflushing procedures must include a separate heater core or A/C heater core flush after flushing or backflushing the engine cooling system. This sequence is due to the fact that the heater core tubes are not clogged with particles washed out of the engine cooling system, because. this can reduce or even block the flow of coolant through the heater core.
1. Disconnect heater outlet hose from engine inlet port and install garden hose (from the tap) with special adapter (type "dad") at the end of the heater outlet hose. Secure the connection with a clamp.
2. Connect a garden hose to the engine intake port and secure the connection with a hose clamp. Dip the open end of the drain hose into a suitable container or drain.
3. Open and close the water supply valve several times so that intermittent action helps flush out the largest, stubborn particles from the heater core tubes. Supply pressurized water for approximately five minutes.
4. Remove the garden hose with adapter type "dad" from the heater outlet hose. Remove the garden hose from the engine inlet port and reconnect the heater outlet hose to the engine inlet port.
5. Fill the cooling system with coolant, which is a 50/50 mixture of Ford cooling system fluid and water. For more information, please refer to the Specifications chapter available in this section.
6. Check the system for correct operation of the heater under operating conditions of the engine cooling system.
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