Rust and sediment can accumulate in the cooling system. Flushing the radiator helps keep the cooling system clean.
Just flushing the radiator, no but to flush the system, yes.
Yes, it is
following this link to see a picture of it. they are used in automotive application with radiator flushing machines http://www.sherco-auto.com/hose.htm
It flushes out old coolant and particulates which have formed in your cooling system.
Mineral sludge from tap water. A good radiator flushing will help and then use proper coolant to help keep the sludge building up and blocking the radiator.
Remove the bottom radiator hose. Put a garden hose into the top of the radiator. Allow the garden hose to run until the water coming out of the bottom of the radiator is clear.
The manufacturer recommends flushing the radiator every 30,000 miles. The radiator should be flushed once every two years regardless of the miles.
If the problem your having is in your 'cooling system' , flushing it out could help out a lot.
See saturnfans.com Barnowl posted a home made procedure for radiator flushing.
Maybe your cooling/heat system is all plugged up with radiator deposits. You could try flushing the radiator and see if it helps.
Calcium, Lime and Rust which is used for the home... most places say not to use it
There may not be one, My 2000 Lumina has a plug on the lower drivers side of the radiator that can be replaced with a petcock. Rather than do this I removed the lower radiator hose to facilitate flushing the cooling system.