coolant overflowing through the reservoir?

2007 BMW 318
350,000 MILES • 2.0L • 4 CYL • TURBO • 2WD • MANUAL
Avatar
GEORGE VICTOR2
  • MEMBER
  • 1 POST
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?
Aug 21, 2023 at 11:40 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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.
Aug 21, 2023 at 4:05 PM