Heres a link to an article I posted about this problem on another forum. When I get time i'll rewrite it here and post the dissassembly image sequence but in the mean time this link may be useful to someone whose car blows cold or hot air only.
Apologies if I have posted this in the wrong forum
[url="http://www.fordmondeo.org/forum/showtopic.php?tid/796588/post/1668548/#1668548"]Mondeo no heat repair[/url]