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      03-25-2020, 10:47 PM   #1

Drives: 2015 BMW M3 Mineral White
Join Date: Sep 2018
Location: Los Angeles

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DIY for Coolant Expansion Tank?

So the actual replacing of the coolant expansion tank isnít difficult, itís just that Iíve never dealt with the coolant before. In the guide below it says to pinch off the lines so that coolant doesnít link, but it doesnt really show how to do it. Iím afraid if too much coolant spills, I may have air bubbles or something in the system. Thoughts? Has anyone swapped out their expansion tanks?

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      03-25-2020, 11:24 PM   #2

Drives: E36 M3, F80 M3
Join Date: Nov 2019
Location: Brooklyn, NY

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I havent swapped out my expansion tank but i did drain the driverside radiator. Around 6 quarts came out and the expansion tank was empty. There wasnt much air trapped in the system after refilling. I wouldnt worry about it since those hoses are at the top of the system. Its probably more difficult when you empty the main radiator.

Dont worry about spilling some coolant. Try to get a fluid pump to try and get most of the fluid out of the old tank first. When you are finished swapping the tank, just refill it to the high mark and monitor it after a couple trips to see if you need to top it off again.
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