![]() ![]() Specifications Opening PressureĪftermarket + topran parts are quality inspected at HANS PRIES GMBH & CO. This can lead to splitting the expansion tank. If a coolant cap is faulty and not releasing pressure it can lead to over pressurizing the coolant system. ![]() The coolant cap, also known as the expansion tank cap or radiator cap should be changed when ever the expansion tank is replaced or a part of any cooling system overhaul. When the coolant temperature and pressure decrease coolant is returned from the expansion tank into the rest of the cooling system. When the coolant system reaches a specific pressure threshold the coolant cap acts as a release valve, vents the excessive pressure, and draws coolant into the expansion tank. it must be lubricated on the seals to prevent sticking and ultimately causing breakage of the cap or leaking on first use.The cooling system in your car is kept under pressure to raise the boiling point of the coolant. ![]() Please note: As advised by BMW - prior to installing the cap. ![]()
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