VW Passat Intermittent A/C Operation

To confirm the intermittent A/C issue, connect a VAG-COM/VCDS diagnostic tool to the HVAC module and monitor 'Compressor Status' while the engine is at idle and while driving. Observe if the system logs 'A/C Pressure/Regulation' or 'Cooling Fan Control' fault codes during the moments the cooling ceases. Additionally, perform a visual inspection of the condenser for debris and listen for rapid 'clicking' from the compressor clutch, which indicates the system is triggering protective safety shutdowns.