Coolant loss

1995 BMW 318I
175,000 MILES
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DAVE41180
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Just fixed the coolant hose connector. Emptied radiator added more coolant and started car to bleed air out. Coolant level dropped and we added more. The engine overheated so we loosened the cap slowly and let coolant bubble out. Test drove it and it drove fine. Second test drive it overheated due to low coolant. So the next day I topped off coolant and got car to normal operating system and it stayed at that temperature but the coolant dropped 4 inches in reservoir. No signs of leaks on ground. Any ideas on where the coolant is going?
Dec 12, 2020 at 12:28 PM
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KASEKENNY
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If you have no external leaks and the engine is overheating, I am thinking you have a head gasket issue. Here is a guide on how to test this:

https://www.2carpros.com/articles/head-gasket-blown-test

Also, we need to pressure check the system and see if it will hold pressure. Here is a video that will help with this:

https://youtu.be/W8kra65m15c

Let us know what you find with this and we can go from there. Thanks
Dec 12, 2020 at 3:07 PM