FLGSHP7

So my engine fan stopped working. I pulled the fan out and it looked fine and the motor seemed to be in good condition. Reinstalled and started playing with relays in drivers side fuse box(K40/2) and voila! It works. Well sorta. Now whenever I'm running AC the fan comes on but when AC is off, its a brick. Is this a coolant temp sensor? Anyone else had similar problems? TIA

P.S. I bought an extra used fan off ebay to help troubleshoot before i checked relays. Got it for a good price so its nice to have a spare around. I have had both fans in the car, same results.