Details

• Brand:

  

  

• SKU:

  CP9Z-8K103-B

• Other Names:

  Radiator Plug, Plug

• Description:

  This genuine Ford reservoir plug is the coolant expansion tank drain plug for the 2011-2013 Ford Fiesta with the 1.6L engine. Ford catalogs it under the 8K103 base as a Reservoir Plug, and it threads into the base of the coolant degas or overflow reservoir to seal the cooling system and allow controlled draining during a coolant flush or service. Though small, it is a sealing component: a cracked, stripped, or missing plug or a hardened seal lets coolant seep out, causes a slow drop in coolant level, produces a sweet smell and crusty residue around the reservoir, and can lead to overheating if the system loses pressure. Owners searching for this part are usually chasing a small coolant leak at the reservoir, replacing a plug that was broken during a flush, or restoring a proper seal after the original became brittle with heat and age. Installing the correct factory plug restores a leak-free seal and the original thread and O-ring fit so the reservoir holds system pressure as designed. Because it is an authentic Ford part it matches the original thread pitch and sealing surface, avoiding the cross-threading and weeping common with generic substitutes. Verify the 1.6L application, seat the plug by hand to start the threads, and tighten it only to the specified snugness to avoid cracking the plastic reservoir, then top off and bleed the cooling system and check for leaks after a heat cycle.

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