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Theres no such thing as a diagram, here are the draining instructions, hope this helps...
1-Place a large drain pan beneath the radiator drain plug. The drain plug is located on the passenger side at the very bottom of the radiator on the engine side.
2-Make sure the engine is cool. Open the hood of the truck and remove the radiator cap.
3-Loosen the drain plug. On the 2000 Blazer, the drain plug is a wing-nut type of plug. Twist it with your fingers until the coolant begins to drain.
*To flush the block, once you have drained the radiator, run the engine for a bit untill the temp gauge goes up to normal, then the coolant will have been evacuated from the block.DO NOT leave the engine on, once it reaches normal temp, (this will happen quick) turn off right away, otherwise you'll be forking out a few hundred $$$ to fix the worped heads. 4-Tighten the drain plug with your fingers once the coolant has drained fully from the radiator. Remove the drain pan and dispose of the used coolant properly. Some service stations will take and recycle your used coolant. Hope this helps...
It should be on the bottom tank of the radiator. The pitcock is usually dirty white in color and will come out by twisting counterclockwise. I suggest loosening the plug in small increments so that you can control the coolant flow as it drains and avoid making a mess.
There is drain plug on the drivers side of the radiator at the bottom, but the safest way is to just remove the lower radiator hose on the passenger side to drain the radiator. The drain plug is plastic and it may crack due to time and heat and you'll have to buy a replacement radiator drain plug, for this reason most newer radiator don't come with a drain plug and if you want one you'll have to install the drain plug kit. If your radiator doesn't have a drain plug then you have the newer radiators install already as the older radiators we still being installed until they were all gone and the new ones were installed.
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1) Drain all coolant from the engine/radiator. 2) Drill a hole in the old plug to allow you to thread a lag bolt, which will then be used to pull the old plug out. Or use whatever means you can to remove the old freeze plug. 3) Thoroughly clean the hole with a wire brush attached to a drill motor. 4) Apply sealant to new freeze plug and locate into the hole. 5) Tamp the plug into the hole, flush with the block, with a hammer. 6) Refill radiator with coolant. 7) Check for leaks.
This isn't going to be easy with the engine in the car, but it can be done.