Chosen Solution
I recently spilled water on my MacBook air. Everything is working except the kernel_task is constantly at 350%. I went to the Genius Bar and they ran a hardware test. The following came back as Can’t Read Thunderbolt ProximityMLB Top SideAirport ProximityMemory ProximityTrackpad Skin Is this all in the logic board and would I have to just replace the logic board?
Try this guide: Electronics Water Damage