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      01-13-2024, 11:24 PM   #4
ghstm2
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Drives: F87 M2/F97 X3M COMP
Join Date: Feb 2018
Location: Bay Area

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Quote:
Originally Posted by F87source View Post
I'm planning to use a vaccum bleeder this summer so I can't tell you too much about the procedure yet. But you absolutely need to run the built in bleeder afterwards to ensure the heater core is fully bled and any air pockets are removed. It's also specified in ISTA to do so.
Someone mentioned to leave the car on accessory mode turn the fan speed to low, heat on high to open up the heater core to allow the system to expel the coolant trapped in there?
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