MacBook is hissing after water spill

Hissing just before it bites you and completely fails from water damage. You need to schedule time with an Apple Store or Apple Authorized Service Center to resolve this. It may cost a ton…

jalfbartlett wrote:

MacBook Pro is hissing after water spilled on it

It needs to be examined by an authorized service center.

These sorts of problems do NOT get better with age.

The tiny traces and leads on the circuit cards are very close together, and one they have been wetted, they grow crystals of corrosion between the traces and proceed to short themselves out. Symptoms tend to be bizarre.