We have a hot water radiant heater that is 60 years old. It has never been bled. It is not a floor board kind or one that looks like some of the radiators I have seen. This kind is a Young and has a cover that has a vent look. When removing the covers, there are two nozzles, one on the left and one on the right side, lower bottom. Since there is not a company here that services them, we need to know how to bleed them. We don't want to open the wrong valve. We don't have a brochure so aren't quite sure what to do. Our heating bill is very high and we are trying to do what is right. We want to buy a new radiator but still need to find out how to bleed the system, hoping it will lower our bill. Please help us. Thank you, JMA