Outback F6-3.0L DOHC (2006)
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Flush the heater core using a pail (at least 4 times).
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Remove both garden hoses from the heater core.
5)
Water flushing of the cooling system
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Warm up the engine completely for more than five minutes at 2,000 to 3,000 RPM.
6)
Drain flushing water
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Raise the vehicle on a lift.
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Drain flushing water from the cooling system.
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Reinstall the engine under cover.
7)
Restore cooling system
