Lets try this, Install this app: TG Pro it will allow you to see the internal thermal sensors and whats happening with the fan. Once you have it running take a snapshot of the main window when its at a point you are getting concerned of the running temp and paste it here for us to see Adding images to an existing question.
As far as your direct question your system has two heat sinks one for the CPU and a second of the GPU. Both feed the heat to a fin system for the fan to extract the heat and push it out through the back of the system. I would leave the cooling system alone as it as its quite good, unless you have something show up under TG Pro. Then we can see what actions would be needed then.
The simple steps is to make sure the vents along the bottom and back are not blocked so the system can breathe. Also make sure you've not over taxed the system running processes which are over stressing it.