hey man i have worked on appliances for the last 6 years and it sounds more like the valvae is not closing all the way sometimes it should be located iin the back on the bottom you can usually get a new one for 30.00 or less some are more expensive especially if you have the ice and water despencer in the door anyways it sounds like it ether is not quite strong enough to close all the way or it could have a piece of debrees caught in it might check that just a guess with out looking at it personally but that is where i would start later mikeb