I had the same issue and looked for a short, hopefully you find your issue quickly, mine raN HOT without the fan and Not using the ac.
Mine wound up being the fan motor itself, hit up Napa and done
"You're only Limited by Your Own mind."
91 YJ, rear body armor with rock rails and TJ filler conversion. LED Tail lights. 33 x 15.50 x 15 SS TSL SX's on black steelies. Home made Bumpers and swing out tire carrier. MileMarker H9000 Winch, H/T & Bikini Top, full doors & half doors. ~RIP~ C.D.K. 11-11-08 (miss you baby)
NTM 1989 XJ 2 Door Cherokee Sport, I6/auto/Swingout carrier, Custom Stereo system that makes my heart skip a beat.. IT'S My New DD and da^% happy to say I finally own one ;)