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|Mark is right - the switch on the Saab that is in the upper hose on the cooling system of the Saab is designed to kill the AC when things get too warm. Thus, it should have continuity all the time, unless things get too hot...so if using this, your fans will be on all the time, unless things get too hot, at which point they'll turn off! :o) Just incidentally, the Saab thermoswitch for the fans is located on the driver's side of the radiator for classic 900's...
There are any number of aftermarket thermoswitches you can use for running electric fans. Your local auto parts store will carry a few options with different kinds of temperature probes and different temperature ranges (some are even adjustable).