i changed the coolant on the five series (e34), and shes coming up to temperature and all grand, but ive got no heat from the vents on the drivers side. so i assume theres two heater matrices and one is airlocked. i went and loosened the jubelee clips on the heater pipeswhere the little controll valve things are to bleed it out. a fair bit of air came out then just water, so i would have thought that sorted it, but no, ive no heating atall now, either passenger of driver. anyone know where i go from here? do i let it cool and the manually fill the matricies with water or what? any help apreciated. cheers