So, then, the 12v side of the Star Cool works? And the 110v side doesn't? I'd keep things as-is and not bother. As was mentioned before, the stock AC and StarCool are tied. Since you say the stock AC is good then the the StartCool must be holding a Freon charge too, and the 12v side of it in some working order.
My StarCool works great after I had a hose with a hole in it replaced and the whole system recharged. I've never used the 110v leg of my StarCool, don't know if it works, don't care if it does or doesn't, never plan to use it.
2003 E-350, 5.4 V8, 2x4, LSD 4.10, WeldTec 6" lift, SMB, Penthouse
2016 Beta 500 RS
2003 Honda XR250R (retirement trail moto)