That means that the radiator is stoped up with trash and engine coolant is not flowing through the radiator.
radiators are cold on the bottom and hot on the top?
On/Off valves in radiators turned off or clogged Another possibility is an air bubble in the loop that services the radiators that are not heating. Correction is to bleed the loop.
Trapped air pocket.
I assume that you are referring to hot water radiators, heated by an oil furnace. These radiators could have air in them and will not allow the hot water to fill them and give off any heat. If these are connected to the same hot water line that feeds the other working radiators, the in and out lines and the bottom on the cold ones should be hot. These radiators will then have to have the air bled out of them. They should have a valve on the top somewhere to do this. If there is no heat in the lines there must be separate line to that room that is plugged or shut off.
Air may get trapped in a radiator, leaving it cold at the top whilst it is warm at the bottom. It then needs 'bleeding'. Radiators may also have the opposite problem, where they are warm at the top yet cold at the bottom. This is caused by a build up of sludge in the radiator and will probably require professional help. Sometimes the downstairs radiators stop heating up, whilst the upstairs ones are fine. This is caused by a problem with the pump and will again require professional help.
there should be a drain plug on all radiators on the bottom of radiator on either bottom corner or possibly in middle on bottom
Airborne dust and grease plus heat combine to paint stains on your walls. The best cure is not to have heat radiate from radiators so it is either a cold nose or clean walls. '
Not all radiators have petcocks. Simply disconnect the bottom hose to drain.
Standing alone the meaning of "where cold where to stay" is unclear. Do you mean, "We are cold, where can we stay?"
Radiators produce heat.
Radiators were invented in 1855
There is a link at the bottom of this page for the USDA site. The cold storage table for many items including these meats are towards the bottom of the page.