[Guest]

The coolan is OK, The motor oil is OK.
The fan turn on when is very hot, but turn off after 1 min while still hot.
How to wire the fan so it remains on all the time?

 

[Guest]

Forget about the fan & solve the root problem. Just because the oil is okay does not mean that there is not a problem. Those model Grand-Ams are notorious for head gaskets. Do a compression test.
I woudl never suggest that a fan be wired up straight. You will burn the fan motor up & then you will not know when it does quit working (for good) & if that happens, you will do some major engine damage.