Fm > KJ Hansen
You should be able to force the high speed fan to come on by putting a switch on the ground side of the high speed fan relay.
The switch will ground the high speed fan relay, regardless of engine temperature.
To install, run a wire from a ground location to one end of the switch,
and run another wire from the other end of the switch to the wire going from the High Speed relay
Although, I've not done this yet to my wife'* '97 LeSabre, I've done it to my '95 Saturn, and would not be without it. I placed my switch on the upper dash to the left of the steering wheel. It comes in very
handy, particularly when driving through the Los Angeles Freeway traffic, which is basically stop & go.
It'* turned out to be invaluable to me, while my Saturn now has 506,794 miles on it. And I'm the original owner.
I should note, such an installation does not
change any of the other computer controlled radiator fan activation inputs.
It is simply an added
way the fan can be turned on.