The flush valve for the radiator on a 1999 Buick Century is located on the bottom of the radiator near the vehicle's frame. When it is loosened, the coolant will slowly drain from the vehicle.
I cannot speak for all models, but my 1989 Buick Century has a drainage valve located near the bottom of the radiator on the driver side of the car, and can sometimes require pliers to open. It's usually easiest to look for it from under the car...
You may not have one. Even if you do, you don't want to use it. They get brittle and crack when opened. Then they won't reseal and you have to run to the auto parts store and hope they have a replacement valve in stock. Just remove the lower radiator hose to drain the radiator.
If there is no drain valve at the radiator you can drain the system at the drain valve on the boiler
radiator drain valve is located at the bottom of the radiator, there is an access hole through splash guard.
I'm not sure about the limited but on my custom the drain is on the bottom right of the radiator when you're facing the car from the front. There's a twist valve on it.
The radiator drain is on the bottom of the radiator. It is a small petcock valve.
To drain the radiator on a 1999 Ford Expedition, place a bucket under the radiator. Unscrew the radiator drain hose or valve on the bottom of the radiator. Remove the radiator cap.
The oil drain valve on a 2000 Ford Explorer Sport is located near the rear of the oil pan. The radiator drain petcock is located at the bottom the radiator.
There is usually a drain valve on the bottom of the radiator, but taking the bottom hose off will do the trick.
Drain plug? Either at the bottom or rear of radiator
A 2004 Chevy Avalanche does not have a radiator drain. The front of the vehicle needs to be raised, then the bottom radiator hose disconnected to drain into a pan.