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Trapped air pocket.

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Q: Why radiators hot on the bottom but cold at the top?
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All the downstairs radiators are cold on the bottom and hot on the top?

radiators are cold on the bottom and hot on the top?


My radiators in the bedrooms are cold and don't heat up but they are warm and toasty in the rest of the house we have oil heat any suggestions?

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.


Does hot and cold water mix with food coloring when hot water rises to the top?

I think not because cold water is heaver than hot water and hot water rises to the top and cold drops to the bottom.


Why is the top of radiator hot and bottom is cold?

Warm gases and warm fluids rise to the top. Same principle that makes hot air balloons fly.


What type of water will things float down faster in warm or cold?

Cold will sink to the bottom. Hot water will rise to the top.


What insure that cold water is forced to the bottom of the water heater tank?

The cold water supply enters the tank at the bottom near the burner. Heat rises, as does hot water. The hot water supply is piped out from the top.


When to check oil level. when engine hot or cold?

On the dipstick there is a safe range. You can check it either hot or cold. When cold the level should be close to the bottom of the safe range. When hot it should be close to the top of the safe range.


What happens when the cold and hot water pipes are reversed on the hot water tank?

You will get warm instead of hot water. There is a tube inside the tank on the cold side that goes to the bottom of the tank and the hot comes directly from the top. Reverse them and you are going to get the cold water that settles to the bottom of the tank. It will not hurt the tank or anything, it just makes for poor hot water.


How does temperature affect the way water moves?

cold water sinks to the bottom, and hot water rises to the top


What are some problems common with central heating systems?

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.


Why is the top of an oven hotter than the bottom?

Because - hot air is lighter than cold air - and thus it rises.


Why is the top of your refrigerator cold but not the bottom part?

the top part is cold because that's where the freezer is and the refrigerator is the bottom part.