Smoking 106!! Please help

[bengal]

Please could anyone give me some expert advice. I have an old 106 xn 1.4 disel. She is smokeing alot from the exhaust when driving round town. On checking the cooling system, lots of hissing and its run dry. There are no leaks, and the engine oil is clean (no gunk on cap). I can however see bubles in the pipes of the cooling system. Are these the problem, and how do i get rid of them ? Also do you know where i can download a free haynes manual for the 106, as keen to try and fix / learn about problems myself.

Thankyou

Matt