I was able to reach up there with a small 1/4" socket driver and a small extension. Not easy, you will probably make a bit of a mess. Takes a little patience. I also suggest flushing the whole coolant system and putting in the green coolant.
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Technically, if your hood is open, look under the front of the car, you must remove all the clips that hold the stone guard up.
At the bottom of the radiator is a round hole on your left side, insert a Phillips screw driver and turn left, coolant starts to flow.
Problem with removing the lower hose is it will splash getting everywhere, use a suitable pan and please recycle at your local recycling center.
under the bottom radiator tank ,look for a plug that has a cross in it . Use a large Philips screw driver and unscrew the plug. You may have to remove a plastic splash guard to get to the bottom radiator tank
the drain "bung" or "spikot" will be located on either the drive or passenger side bottom corner of the radiator. in some cases you need to remove a splash guard or skid plate in order to access it. once you find it you should be able to slip a 3/8th or 1/2 inch hose over the end in order to run it neatly into a container
there should be a drain **** on either side of the lower radiator. you might have to remove the splash guard to get to it easier, If it is not leaking then the o ring does not need replaced when you drain, the drain plug does not have to be removed all the way, it has a drain hole on it when the plug is loosened to a certain point it will allow to drain. If you remove all the way then go ahead and inspect o ring and replace before installing again. but always lube an old or new rubber o ring with (oil) before installing. Installing a dry rubber o ring will result in possible failure.
It's on the lower corner of the radiator on the side facing the engine. If you pop the hood and shine a light down there, you should see it. Some are on drivers side, some passenger side. Depends on where your radiator hose is. It's usually on the other side. It should just be a plastic plug. Some are hex shaped (wrench for removal) some look like a plastic wing nut. It could also either be black or white.
It's usually easier to get to from the top side bending over. From underneath, the core support (cross member to some folks) is usually in the way unless you scoot back far enough under the truck to look up at the radiator. Doing this is also a sure way to get anitfreeze on yourself when you pull the plug. Been there/done that. Haha.
It's probably located under the splash guard and should have either an internal hex head, an external hex (like a bolt head), or both. You can also drain the radiator by pulling the lower radiator hose.