MacBook Pro 16″ (A2485, A2780, A2991) Left Fan

An aging fan may become noisy and inefficient or simply fail and stop spinning, leaving your laptop to overheat and eventually damaging your processors. Replace a defective left fan to fix overheating problems or to keep your model A2485, A2780, or A2991 MacBook Pro 16″ laptop running quietly.

If your screen is facing you, this is the fan on the left side of the machine.