Like I say 1 radeator in the bedroom will not warm up yet the rest of the house is fine

Most likely there is air in that one radiator. There should be an air bleeder on the top return side. Open it up until you get a good stream of water then close it and see if it heats up.(have a cup and towel handy to catch water).

If bleeding the line as mygirlsdad77 mentioned does not work you might check to be sure the system water pressure is correct.

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Originally Posted by hvac1000

If bleeding the line as mygirlsdad77 mentioned does not work you might check to be sure the system water pressure is correct.

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Thanks it was the water pressure. So again thank you so much ray:)

Usually the problem is one or the other. I just guessed correctly. Glad you got it going and remember those two cures if you have problems in the future.