Only cold air and coolant leak.

[SilverS8]

Hi.

My S8 started out loosing some coolant 2 months ago and i could see that the reservoir tank was leaking, so got a new + cap from the dealer and hoped everything would be perfect. So it was for 2-3 weeks until the annoying coolant level indicator came on once again... i refilled and 1 weeks later same **** again. Of course i found several pages on the oil cooler plastic pipe leak so had the car at a friends lift and removed the plastic cover, let the car run for ages but no sign of any leak. From earlier experience there is usually no problem finding G40 leaks since it leaves a light pink color when dried.. The engine looks like brand new and dry as dessert sand underneath..

Today when going home from work i turned the heat up a bit but only cold air came out and the coolant "alarm" came on again... Engine temp is fine and coolant level is just below minimum..

car is also dry inside..

I can also mention that from time to time when the car is started when still close to operation temperature the lower part of the front screen becomes covered with dew/fog or what you call it. This never happens if engine is cold.


Any suggestions? could all be because that plastic pipe or are the A8/S8 also having trouble with the "radiator" inside the car?

All feedback will be very appreciated