Zafira 1.7 CDTI ecoflex engine (Engine code A17DTH) coolant bypass pipe replacement repairs.
Final part! How to solve the problems and finally get it fixed.
Parts used:
55581546 - Coolant thermostat bypass pipe (Genuine Vauxhall part)
97252585 - O-ring seal (Genuine Vauxhall part)
97240798 - O-ring seal (Genuine Vauxhall part)
SAEJ20R3 Flexible Radiator Coolant Pipe (19mm x 28mm (3/4 Inch))

Is it worth the fix? I'm not sure! This took so many man hours to do, it was very difficult. In reality the engine should probably be removed, turbo removed, exhaust manifold removed, etc, due to where this pipe is located.