CAUTION: The heater core must be backflushed separately from the engine cooling system. This is to ensure proper flow of flush water through the heater core. All engine cooling system flushes and backflushes must include a separate backflush of the heater core or A/C heater core, performed after the engine cooling system flush or backflush. This order is to prevent debris flushed from the engine cooling system from clogging the heater core tubes, which can reduce or block the flow of coolant through the heater core.
1. Disconnect the heater outlet hose from the engine inlet port and install a garden hose (from a tap) with a special adapter (male type) on the end of the heater outlet hose. Secure the connection with a clamp.
2. Attach a garden hose to the engine inlet port and secure the connection with a hose clamp. Place the open end of the hose, intended for drainage, in a suitable container or drain.
3. Open and close the water supply valve several times so that the intermittent action helps flush out the largest, most stubborn particles from the heater core tubes. Apply water under pressure for approximately five minutes.
4. Remove the garden hose with the male adapter 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, a 50/50 mixture of Ford Coolant and water. For more information, refer to the Specifications section in this section.
6. Check the system for proper operation of the heater under operating conditions of the engine cooling system.
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