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Central heating air returns after regular bleeding?

I regularly have to vent one upstairs radiator. It's a fully pumped system with a two-way valve CH/HW. Header tank is full, so I am puzzled where the air can be entering on such a regular basis ? All other rads and HW are fine.
Duncan, January 2007
Many thanks ... would raising the vent pipe by approx 30cm (max distance to roof) be likely to help significantly ?

Duncan, January 2007
can be taken in through vent pipe

hi-spec plumbing, January 2007