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Hi, I have radiant heating system that has been acting strangely this year. I have been living in my house for 5 years and this is the first year that there is a distinct temperature difference between the main & 2nd floors, about 3 Degrees celsius difference. We have an old cast iron system that was installed in the 1920s with the boiler located in the basement and it was replaced in 2003, 2 years ago we renovated the basement and installed 2 new style radiators to replace the electric heating down there, which the boiler has the capacity for and these worked fine for a year. We also have the original expansion tank that was installed in the 1920s, however every single valve in the system is seized open as long as I've been here, except the fill valve and one which I replaced 3 years ago because it cracked (Power outage caused it to freeze). I have been draining, refilling & bleeding the entire system each year since we moved in and every spring I drain it the water that comes out is black, however all the rads heat evenly top to bottom so I don't think there is a massive build-up of sediment. I am wondering why all of a sudden this year the 2nd floor is much colder than the main floor, the rads on the 2nd floor get warm, but not hot like the ones on the main floor. I am wondering do I need to do an overhaul on this system next summer? (replace all the stuck valves, flush the pipes & rads, clean the pump out) Do I have an airlock somewhere? Unfortunately every technician I've had come in is fundamentally useless and just messes around in the basement for an hour or two then says I need various different unnecessary repairs and proceeds to leave the system in pieces which I have to put back together myself so I have heat, the last technician completely unhooked all the circuitry and said I needed to call an electrician. I have lots of experience with electrical & plumbing and can perform almost all maintenance tasks as long as they don't involve touching gas lines. Any help, thoughts or insight would be greatly appreciated.