My free internet diagnosis is that the cpu fan is on the fritz. Assuming you saw a big performance improvement after the SSD upgrade, it most likely means they replaced the hard drive with a SSD. One really easy way to check to see what it was replaced with is to go into the Device Manager and look under "Disk Drive" and it'll show what drive is installed.
When I replaced my hard drive in the laptop I'm typing on now with a SSD about 2 years ago, I noticed a pretty big performance improvement but I also noticed that the cpu fan was coming on much more often. This makes sense since before the SSD, the cpu was idling most of the time waiting for the slow mechanical hard drive but now with the SSD the cpu can run much faster which means it's going to get hotter and the fan is going to be on more often. If your fan was making noises before the SSD install then it was already on its last leg and the SSD install just pushed it over the edge so to speak.