Just posted this in another thread the other day. You can remove both relays. Just cut the resistor wires, remove the resistors, then solder the remaining wire ends together. Now when your fans should be on low, they will be on high. Pull a/c fuse and your a/c button will turn on your fans
Stock, your coolant temp sensor on the thermostat neck need to see 190 for the thermostat to open. Once this happens coolant flows to the radiator. Once another sensor in the radiator sees 180 degrees the fan should kick on low. When it sees 200 the fan should kick on high.
If you don't have a/c or you want to test it another way, you can pull your a/c fuse. Now pressing the a/c button should turn both fans on low. I don't have a/c so I pulled the fuse. I also got rid of the resistor packs on both fans and soldered the wires together. Now when my radiator sensor sees 180 it turns the fan on high. And if I press the a/c switch both fans turn on high instead of low. Basically low and high both equal high now.