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Coolant overflowing through the reservoir?

Tiny
GEORGE VICTOR2
  • MEMBER
  • 2007 BMW 318
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 350,000 MILES
I have an: 318d - 122hp/90kw -m47engine- BMW - 2007. The coolant disappears from the reservoir after a 20km trip, yellow warning on dash. No leak, no smoke, no oil level increase, no oil in the coolant. I let the car run without the coolant cap, topped at max - and it stayed like that, then car heat up to 95*C degrees, coolant came up the reservoir bursting out, overflowing. Do you have any ideas?
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Monday, August 21st, 2023 AT 11:40 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
This sounds like you have a blown head gasket, even though you don't have coolant in the oil a head gasket can still be bad.

Please go over this guide to help confirm the problem:

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

Or you have a water pump leak which only leaks as you drive.

Please go over this guide as well:

https://www.2carpros.com/articles/car-is-leaking-coolant

Please go over these guides and get back to us.
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Monday, August 21st, 2023 AT 4:05 PM

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