how do you bleed a radiator?

Question

ive got the key type thing for the bottom but what do you actually do?

Answer 1

You bleed the radiator from the top. Turn the key until you hear air hissing from the bleed hole. Hold a rag over the hole to catch any drips and turn off the key when the hissing stops and water comes out. DO NOT bleed the radiator while the pump is running. You should do it while the system is not pumping water around the radiators. If you don't, its actually possible to suck air INTO the system which will make things worse.
You should also run your central heating system once a month IN SUMMER until the radiators get slightly warm. This is to prevent the circulating pump and diverter valves from jamming up through lack of use during the summer when your heating is dormant.

Answer 2

The guy with no name has it right, if it's central heating rads you are asking about?
Your key type thing fits in the top of the rad not the bottom, Have the heating running, not too hot, turn the key until you hear the air escaping wait for a few drops of water to come out, catch that in a sponge or similar, turn your key to stop the water, go to the next radiator and do the same etc until all rads are free of air.

Answer 3

Attack it with a knife and hide the evidence,lol

......Joking aside

You should switch them on first and make sure that you need to do this!!!
If you do they will have cold spots on the radiator even when its been on a long time

On the side of your radiator at the TOP, (i m British don't know if its different anywhere else) there should be a small nut inside of a recess.
You need to turn the nut ever so SLIGHTLY until u hear the air escaping (take precaution when doing this because if that water gushes out you will be sorry its possibly hot, brown, smelly and not very nice at all) when the water starts to come out of the valve you need to re-tighten the nut DO NOT TIGHTEN IT TOO MUCH !!!! i tightened it too much and broke one off. 0o0ops.
you should lay a few absorbent rags down around the work area just in case. better safe than sorry



.....Or you could pay some one to do it for you, On the bright side you wouldn't flood yourself. at least if it did you'd have some one to blame.

Answer 4

You don't bleed a radiator from the bottom . You need to loosen the little square headed screw at the top of the radiator . Air will come out do this until you get a drop of water coming out .That's it job done.

Answer 5

Use a radiator key to unlock the bleed nipple at the top of radiator. When only water comes out job is complete. make sure you tighten the bleed nipple up . And hey presto job is complete

Answer 6

First, get a rag. When the heatings off, gently turn the key until you hear air coming out (like opening a fizzy drink), when water comes out it should drip onto the rag your are holding there, it might smell bad, that's normal. Once the water starts coming out, it's done so just tighten back up.

Answer 7

Usually there's one or two petcocks underneath the radiator that need to be unscrewed. Once they're unscrewed, you're done.

Answer 8

Turn it either clockwise or counter-clockwise with the cap off the top. Make sure you have something underneath to catch all that pours out. (Please make sure you waited enough time to let the car cool down....)

Answer 9

dont know.