I am not sure what you are trying to ask or accomplish.
I suppose if you trying to add a manual switch somehow, or the car came that way, this would allow control to turn on the fans.
If the vehicle has a two speed fan relay, often it will not go high speed until 225F? is reached.
As far as wiring correctly and a manual switch is concerned, that can become a bit complicated.
I would want to consult the FSM wiring diagrams/ electrician/gear head member, and make sure I'm not going to cause damage to the electrical system, by trying to feed or cut power in the wrong place.
1997 Buick Pk Ave (Soft Ride) Suspension!