Chosen Solution
Mac Fans Control is an excellent utility for ensuring that your Mac system remains cool. I use this on my Mac Pro 5,1 to keep the temperatures down. However, I am not sure how to configure this on my MacBook 15" Retina. I would like to keep the CPUs and the GPU cool. For this I need to know which fan is physically located near these devices. Where can I find a drawing showing the location of these devices in relation to the fans?
The location of the fan is not really a big deal. Just set the fan with the higher RPM to the CPU and the lower RPM to the GPU. That’s what I do for my 2015 MBP (very similar design) and it keeps it nice and cool.