[1972ChevyCheyenne]

I just got this rad and fan set up with the wiring harness. With the harness it includes a 180 degree temp switch. Where do I put this switch? In the block or intake manifold the fans will be all the time. If i put it on the cool side to the rad the fans may not run enough. Do I need something else rather them this switch? Help would be appreciated. Thanks. Jamie