Coolant leak!!

[DomRuffle84]

Hi everyone first post so pls bear with me!
I have a A4 b7 2.0T I have some coolant leaking from around the thermostat housing area, i have replaced all pipe work around the housing but the leak remains what is the likelihood of the housing it self having a crack or could it just be the seals that have gone?
Can you replace the o rings or is it worth replacing the whole housing altogether?
Any advice greatly appreciated.
Thanks.

 

[Baka]

Given the work involved to get the thermostat and housing off, I would definitely replace the whole thing. The are quite a common failure anyway.