Hey fellas, I'm having a little problem here with my girls 97 prelude. For whatever reason, the E fans won't kick on when this thing is getting hot. I mean it was all the way in the red and I had to kick the heater on full blast to get it down. This was while it was 90+ degrees out here

The one thing that I have noticed was that the E fans will only kick on during the use of the A/C. So my question is WHY?? What would cause my A/C to be able to kick on my fans and not have the overheating temperature kick it on??? Is there a temp sensor that I'm not aware of?? Any help would be appreciated!! Thanks
Nick