Can I or not resolder a Joint

[utterlydiy]

I have recently fitted a new radiator on another wall and laid new piping tapping into the system where the old radiator was connected.

My problem now, one of 18 joints using the already soldered fittings is weeping taking approx. 3 days to barely fill a teaspoon.

My question, could I resolder that joint whilst the water is still in the system or do I have to drain to do so.

Thanks

 

[Terry7556]

drain down bud, annoying insnt it

 

[calorific]

You've got more chance of getting a camel through the eye of a needle than soldering a wet pipe

 

[dcawkwell]

You'll need to drain down.
And ensure you get the water out of that bit of pipe.
If there is any it won't solder properly.