AC doesn't cool after 1-2h drive, esp when it's hot outside. It closes all lids, but the fan inside does operate, as one can hear! 

Gas is filled newly, the second fan of the cooling-system is new, the 2 motors of the lids were renewed  1 month ago also.....

Has anyone an idea of the failure or how to get the system working properly ?

(Superb I, 2,5TDI)

 

Remove 384 relay behind fuse box. Either replace it, or preferably, re-solder the broken soldered joints for the actual relay. It's usually the coil connection pins which break. Occasionally, the sm driver FET will need replacing.

 

It's hard to believe that VAG have not found a solution to mounting an open frame relay on a PC board which will withstand repeated thermal cycling + a large degree of self-heat from the coil. I worked for a UK electronics company and solved this problem 40 years ago.

 

rotodiesel.

To Rotodiesel: Thank You so much, I do hope, it will work properly afterwards. I'll give You a notice.