BMW E36 Radiator Cap 140 Degrees - BMW 17137639023 Bmw E39 R

BMW E39 Radiator (Expansion Tank) Cap - 140

Original BMW (17137639023) | 1.4 Bar Pressure Valve | Branded Product

This is the factory original Original BMW (17137639023) branded radiator spare part water reservoir cap, produced for the cooling system of BMW 5 Series E39 (1995-2003) vehicles (especially those with M57 diesel engine versions). This part is not just a plastic cap that holds water inside; it is a precise 1.4 Bar (140) pressure adjustment valve that maintains your engine's temperature balance and prevents the system from bursting. Caps that lose their functionality over time due to spring fatigue or hardening of the o-ring gasket can cause water to evaporate unnoticed or hoses to swell excessively. It offers 100% original BMW assurance for those who do not want to leave the cooling system to chance.

• 100% Original Branded Part: Completely eliminates the risks of "opening at the wrong pressure" or "premature failure" commonly found in aftermarket caps. Restores the quality and reliability of your vehicle to that of the day it left the factory.
• Vital 1.4 Bar (140) Valve: Safely releases excess air when the system pressure exceeds 1.4 bar (when it reaches a dangerous limit), and reseals the system when the pressure returns to normal, preventing the coolant from boiling.
• Sealed Original Gasket: Thanks to the original rubber gasket that withstands constantly changing temperatures (expansion/contraction) under the hood, it effectively stops the water in the system from evaporating and escaping.
• Hidden Water Loss and Overheating Solution: If your vehicle is constantly losing water but you cannot find any physical dripping (leak) in the hoses or radiator, you can solve the problem by replacing your faulty, steam-leaking old cap with this original part.

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