hot water heating system problems

we have a hot water boiler/radiators heating system.
I have to keep bleeding the radiators upstairs. is this normal?
where is the air coming in/water going out?
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Defective or waterlogged expansion tank, perhaps? Are any pressure relief valves leaking or releasing water? The air replaces the lost water when the system cools.
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No, it is not normal.

With all due respect, I can't see it from here, so I can't tell. You may have a leak somewhere. It may be in the boiler or the piping. Call an experienced hydronic tech to look at it.
http://tinyurl.com/uc1r
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