Dual activation cooling fan relay will turn your cooling fans on when the engine reaches the preset temperature of the thermostatic switch mounted in the engine head or when the A/C is turned on Ideal for installing air conditioning in your project car Features simple to use Posi-taps for the ignition and A/C compressor connections Kit includes: Three 40-amp relays with mounting bases & wiring, fuse holder & 70-amp fuse, two LT1/LS1 fan connectors, thermostatic switch, adapter and insulated terminals