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Thread: radiators only bleeding air, no water

  1. #1

    Default radiators only bleeding air, no water

    Hi - i've been noticing our (hot water) radiators have been in need of bleeding (cold at the top, hot at bottom) so I went ahead and did it yesterday. I shut off the system, turned off the fill line and bled the radiators. I started on the downstairs units and they bled air to water just fine. Then I went upstairs and only got air...loads of it. Almost every radiator on the 2nd floor bled air for about 15 seconds, but water never came. I wasn't sure what was going on, so I decided to turn everything back on and see if it would refill properly.

    Now that it's back on, I feel some warmth in the radiators upstairs, but they are generally pretty cold. My wife is complaining that it's freezing in the bedrooms (it is) so I need to figure out why I can't get the upstairs to bleed properly.

    Did I screw up by starting downstairs? Should I drain and then refill the whole system?

    I could really use some help here. Thanks, Matt

  2. #2
    Sprinkler Guy Wet_Boots's Avatar
    Join Date
    Mar 2007
    Metro NYC


    You need water flowing in, in order to push the air out. You do have a working pressure reducer feeding this system, right?

  3. #3
    Jack of all trades frenchie's Avatar
    Join Date
    Dec 2006
    Brooklyn, NY and Fire Island, NY


    The fill line needs to be left on.
    Master Plumber Mark:

    there is nothing better than the
    manly smell of WD 40 in the air
    while banging away on brass with a chisel and hammer...

    it smells like......victory......

    do not hit your thumb...
    Just so everyone's clear: I'm the POODLE in the picture ("french", get it?) The hot woman is my wife.

  4. #4

    Default ok, fill line is open...still only getting air

    So I shut off the system, left the fill line open and still only get air coming out (upstairs).

    I looked at the fill line and there is a B&G reducing valve (model 110192) with a 'flip lever' on the top. It seems that water only enters the system when I flip the lever up.

    Inbound water pressure is about 40 PSI, and I have a booster that takes it to 65 PSI.

    Is that valve working normally?

    Thanks, Matt


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