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Cake day: October 27th, 2023

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  • The spring and cap are heat/pressure(usually pressure) activated, meaning that as pressure/heat increases the spring in there will coil upwards and open itself slightly for excess water from pressure and allows for that water to come out and into an expansion tank.

    There are certain vehicles literally equipped with stronger/stiffer springs in them to handle different amounts of pressure; usually 13psi is the usual but sometimes they are rated upwards of 18psi, each manufacturer is different.

    I’m sorry you have ZERO clue how these systems operate, don’t come in here giving bad information especially when it’s a well known item in modern cooling systems since about the 80s and you could have simply googled it if you were unsure.








  • Ensure its the correct blue or green coolant needed for BMWs. A pre mix is fine, but it needs to be the blue if it’s blue or the green if it’s green.

    Recently bmw has switched some vehicles in the 2018+ range to HT-12 which is green and you’ll need to simply open the cap and check which color and you’ll know.

    It will most likely be blue, but owners manual should also tell you which one. And no, no draining is needed but coolant systems are closed loop systems….they usually shouldn’t leak, especially a newer 2021 model.

    It’s under warranty and I’d take it in for a free inspection and have them look it over. You could be leaking from something and you’re not aware.