Overheating Cadillac Eldorado 1992

Originally when I posted my first question the issue stemmed from my car overheating and the coolant bubbling over the top of the reservoir at temp 230-260.I was told to replace the thermostat and that it would most likely fix the problem and then the fans would engage also. The thermostat was replaced so the temp stays in a good range while driving but when Idle it goes up and overheats, so I checked the fans and they still wouldn't engage. So I though I would need to replace a relay or cooling fan sensor and when I searched for the location I notice the cooling fan fuse was blown, I thought that was my problem and it was because as soon as I put the new fuse in my fans worked, however shortly after my fuse blew again. I tried getting a stronger fuse as well and I would turn the car on my fans would come on but seconds after it blew too. So I was wondering what could be making my fuse blow? What could be causing this shortage?