I have year 2000 Avant 1.9TDi.

Recently I found level in reservoir down to about half. (The level normally stabilies just above minimum mark and blows out if topped up higher). Topped up with antifreeze / water mix and confirmed the level was dropping.
Initially could not work out where leak could be then spotted pink staining on gearbox housing followed by stains on hose to heater - hard to see never mind access!!

Took to local independant to examine. They said replacement of hose and alloy fitting as alloy fitting corroding was required. I had this years ago on auto choke housing of an Astra so was happy with diagnosis.

The job was done Friday afternoon. After a run today I checked a coolant level and noticed it was down again. I then looked at problem area and found still wet / leaking. As I've said difficult even to see but leak could be between the alloy fitting the hose is connected to and the next metal part, or water could be running from higher up.

Possible the garage have just not have fitted properly, access is difficult - or they have not found / changed the faulty part.
I will be back to them tomorrow.

Has anyone else had this problem?
Should the garage have changed another part?

Any guidance will be appreciated.