we recently purchased a home with no basement that had the radiators converted to baseboards. (1) section of heat on the main floor was ice cold, a bleeder was installed, good news - it got hot, bad news the cold problem transferred to another section of baseboard. Bleeders were added to the remaining (2) sections on the main floor, good news - they are hot, bad news - original cold line is struggling... water is hot going in, but is cold or luke warm in the fins.
We are considering the following before the massive task of tearing it all out and starting over.
(1) adding reducers to upstairs baseboard (goal - reduce temp upstairs, reduce flow upstairs to hopefully send more to cold line)
(2) add pump to cold line.
Appreciate some advice.