Coolant Leak

[Asahi]

My 2004 Avant 1.9tdi has gradually needed the coolant topped up more frequently to the point now where every few drives the coolant warning light comes on and the expansion tank is empty so I really need to address the cause.

Went for a drive in the hopes to create pressure in the system, I inspected the engine bay and found a possible suspect.

The pictures were taken before the drive but I believe coolant is leaking somewhere out of a pipe/gasket at the back of the engine which I bet is going to be a pain. I'm thinking it's todo with the coolant flange?

I think this may be the replacement part but I am not certain, VAG OE-038 121 144 A

Any help would be most appreciated

 

[Mike B]

The pink stain shows where the gasket is weeping.Can you tighten the nuts to see if it helps?Seems a strange place but maybe its had work in the past and not joined right

 

[Asahi]

The pink stain shows where the gasket is weeping.Can you tighten the nuts to see if it helps?Seems a strange place but maybe its had work in the past and not joined right

I removed as much as I could to get close to the flange. I reckon the coolant supply hose to the flange is perished around the clip so to save future hassle I will replace the hose & flange. I am unsure on the part numbers though so will have to research.