[FunkyMelon]

Actually a very common issue, though documented more on US forums.

Have you got any pictures at all? I've got the same issue, though mine is a very minor weep and with the recent heat, the air con has been on, so the heater matrix hasn't been filled with coolant much.

Mine only starts to weep if I put the heater on max, then the smell comes through the vents.

Anyway, I believe you have to drain the coolant, pop the pipes apart, remove O rings, use some Vaseline to slide the new rings over the pipe and push back together.

Make sure you use new plastic clips too, the old ones will be brittle.

Not the hardest of jobs but can be a pain getting the new O rings on.