WHY IS YOUR RADIATOR NOT HEATING UP? If your boiler is working but one or more of your radiators are cold or they are not heating up evenly, then there are things you can check before you pick up the phone. If the radiator is cold at the top and hot at the bottom, making gurgling sounds or taking a long time to heat up then that is a sure sign that it needs bleeding. HOW TO BLEED YOUR RADIATORS Turn on the central heating and check all the radiators. Switch heating off and le