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There's a draincock down at the bottom. Open it up and drain the radiator. What I like to do next is remove the t-stat and replace waterneck. Now fill radiator with water (actually fill degas bottle) and run engine with upper hose removed at radiator. Flush until only clean clear water comes out of hose. Drain radiator, replace t-stat, fill radiator with coolant and you're done.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.