1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 23Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 23

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Flushing Engine Flushing Cooling System with Engine NOT Running (Using Cowl Flush Plug)
NOTE: DO NOT have the engine running above idle speed when flushing the cooling system using the cowl flus