Prev4 of 5Next Signs You Need to Bleed Your Radiators If your radiators are noisy, take longer to heat up, or have cold spots at the top, they likely need bleeding. Regular maintenance can prevent these issues and keep your heating system efficient. Prev4 of 5Next Signs You Need to Bleed Your Radiators Post navigation Turning Down Radiators in Unused Rooms Checking and Adjusting Boiler Pressure