Hi,
Won't make any odd's as the air is not stuck in the coil, but in the heating system.
As a guess i would say that you radiator's downstairs are on drop's , maybe you have solid floor's downstairs?
If so then the air is more than likely stuck at the top of these, which is why the upstairs radiator's are getting hot, but not the downstairs ones.
As soonas you are able to isolate the hot water coil, you will be able to force the air from it's current position.
HTH Sam
Won't make any odd's as the air is not stuck in the coil, but in the heating system.
As a guess i would say that you radiator's downstairs are on drop's , maybe you have solid floor's downstairs?
If so then the air is more than likely stuck at the top of these, which is why the upstairs radiator's are getting hot, but not the downstairs ones.
As soonas you are able to isolate the hot water coil, you will be able to force the air from it's current position.
HTH Sam