• Sounds like you have a heater hose with a hole in it. the squeling sound is the air pressure leaking. caution.....the steam and air emitted can severly burn your skin. use a heavy towel when inspecting. You may need to replace the hoses to your radiator. inspect them, but do so very carefully.
  • M cars should not be doing this - take it back to your Infiniti dealer for a diagnosis. It should be still under warranty.

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