adding an on/off toggle switch for cooling fan?
Aside from wearing out the fans really quick? Just because they still spin,doesn't mean they're still moving the amount of air they're supposed to. Generally,it's a bad idea to run the fans all the time (unless it's an emergency),but loaning out one's car to others is an even worse idea in my experience. The load the fans place on the electrical system when running constantly is substantial,and likely to overheat wiring,connectors,relays,etc,etc...
Winner 2001 Road Course (prep. class) Detroit,MI
Winner 2006 Drag race (SS class) Indianapolis,IN
Quickest event reaction time .013sec. (final-round)
Class Winner 2014 Charlotte,NC. 2016 NOLA car shows
Winner 2019 Road Course (prep.class) Pittsbugh,PA