ANSWERS: 3
  • It could be as simple as a bad radiator cap.
  • Not quite enough info here. Is the car running when you get this bubbling? What is the engine temperature when this happens? If you are getting this bubbling after running the engine for a length of time, it could be caused by a release of pressure due to overheating. If this is happening with the engine running, before it has warmed up, it is likely a blown head gasket.
  • Thermostat could be bad. If it bubbles after you just shut the engine off, that could be normal. When it cools, the engine will suck it back.

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