I wonder if anyone can help out here, we had a problem when the radiators upstairs were warming up but downstairs were cold, we called a couple of plumbers and they said it seems like our pump is on its last legs...so one guy installed a new pump- great stuff-the radiators all started working and heating up, then we started to hear weird noices from the pump, like loud squaking voices, i tried to get in touch with the same plumber, couldn't get hold of him, so we called someone else in who said he'd put in a bigger pump but it was on a slight angle, so when the water wasn't reaching the top of the pump it was heating, hence the voices!! that was his theory, so he cut around the wood, (the pump is in the floorboards in the loft) and straigtened it. well since he did that the radiators stopped heating up again, i tried to get hold of this same man and he dissapeared too!! so then i called someone else, and he said we have air in the pipes-to bleed the radiators, so we did that, and we even took most of the radiators off downstairs, washed them and put them back on- but no they are not heating up, now only one heats up upstairs and downstairs are totally cold. what is it?? what can it be? is it worth calling out a professional who will just run away with my money but the problem will still be there? is it something me and husband can fix ourselves? we are sooo confused now...please help someone!!