The new Ford 9C3Z 8101 B Degas Bottle Cap is commonly used to stop leaks in the Degas bottle itself. A worn or damaged cap will contain imperfections that stop a positive seal from occurring. Signs that this problem is occurring would be a white residue present on the exterior of the degas bottle.
Ford 9C3Z-8101-B Degas Bottle Cap
When the spring in the original cap gets worn out the engines cooling system is not functioning at its full potential. A failed Degas Bottle Cap has lead many Ford Powerstroke owners to believe their head gaskets have failed. A malfunctioning coolant cap / degas bottle cap will allow your coolant to boil before the engagement of the cooling fan. If the degas bottle is leaking, you will see a white residue below the cap as it dries. This white residue is from the evaporated coolant.
The new Ford 9C3Z8101B Degas Bottle Cap Stops Leaks in the Degas bottle itself from a weak cap or imperfections with sealing that present a white residue on the exterior of the degas bottle. A cheap and easy solution is to replace the Degas Bottle Cap with the new Ford Updated Degas Bottle Cap and see if this solves this issue.The Ford Degas Bottle Cap - Replacement Coolant Cap is an OEM Ford Part.
NOTE: After replacing the Ford 9C3Z-8101-B Degas Bottle Cap degas bottle cap / Radiator Cap you should only fill to the MIN - minimum line on the bottle when cold.