I did a DIY coolant flush this weekend. I pulled the front bumper and bellypan, took off the cap on the expansion bottle, and opened the petcock on the bottom passenger side of the radiator. I let all the coolant drain, refilled with distilled water and let the car idle. I flushed about 4.5 gallons out of it. Replaced with the new yellow motorcraft coolant, distilled water, and a bottle of water wetter. Is there an easier way? On my 05 F150 I would always just pop the lower radiator hose off because it doesn't have a drain valve on the radiator.