" running on eco" is the problem, I have had 5 omega's over the past 10 years and covered over 200k, in the UK, France and Spain, the aircon system on the Omega is designed to be working for 90% of the time, as well as controling the temp it also takes the dampness out of the air before it enters the cabin. To run on "eco" in damp weather you need to have driven the car in dry conditions for a couple of hours to really dry the "eco" air ways.
Please try this.
best regards,
richard
Any A/C will act as a dehumidifyer. However, I think this is not the cause.
As an experiment, since this thread started, I've had my ECO On (A/C Off). I am not seeing these problems. I think the issue is just there is a high moisture content in the car. Yes, A/C will help overcome this, but as A/C appears to be broken in these cases, other methods to reduce the humnidity in the car is required:
Stick a dehumidifyer in overnight
Try to dry car with good ventilation (ie sunroof tilted or windows slightly open)
Dessicant packs
These should help reduce humidity in the car, and therefore reduce the problem.