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Radiator doesn't get hot until it is gently tapped.
I live on the sixth floor of an apartment building. I have a new steam radiator including the on-off valve and the air valve. Most of the time when the steam comes on the radiator will not get hot until we gently tap the radiator itself a couple of times. Then you can hear the air start to release and the radiator starts to get hot. It seems like an air valve issue but could it be something else since the air valve is new?