It goes to the water pump.
If you will follow the top radiator hose to the engine, you will see were it clamps to a housing. It is under that housing.
Depends, It could be either the discharge or suction hose.
The 4.3 litre V6 engine in a 2000 Chevrolet Blazer has a timing CHAIN
Yes, there is an "O" ring inside the fittings.
how many gallons of antifreeze in a 2003 blazer radiator with a/c
The 2000 Blazer with the 4.3 engine has one coil.
5w30
Yes. They both use the 4L60E transmission.
Approximately 19 Gallons according to Lotpro : http://www.lotpro.com/cars/2000/chevrolet/blazer/techspecs
It is located on the bottom right hand side of the radiator.
It is behind the grill and in front of the engine.
It has a timing chain.