Afternoon all, new to the site & im really hoping someone can help. I have a 2010 Audi S3 8P sportback & the A/C is not working. The system is pressured & the refrigerant level is fine. I’ve replaced the G65 sensor on the advice from someone & still nothing. The red light on the A/C switch doesn’t stay on. On running a diagnostic check a 00819 high pressure sensor fault code has appeared. I’ve reinstalled my old sensor and the fault has cleared, the red led now stays on the switch but the A/C still doesn’t run. I think I can hear the compressor activating by the change in sound of the engine but no cooling fans start running. I’m at a loss now??