So, a bit of back story. At my school, we have a design center where students can work on their teams and have access to tools and supplies, etc. Last semester, one guy started building a large (~70cm^3 print space, ~100cm^3 total size) 3d printer, based on a reprap concepts, for the whole design center to use. However, this semester, he's gone on co-op, with the printer built but non functional. My team leader tossed the project to me, since I finished building my Prusa i3 this summer and was using it to print parts for our project. I got the wiring finished up and the motors move and home just fine, but one odd issue persists. When I turn the extruder heater on, it overshoots the correct temperature by 60-70 degrees. That is, I set it to go to 190C, and it went clear up to 260C before cooling back down to temp and maintaining it. Once it's there, it's fine, but that temperature spike could burn filament and clog the nozzles. The printer uses a Kraken 4 head extruder, which requires a water cooling system, but that's all set up as well. Any advice or suggestions would be much appreciated.