Audi S4 cabin not warming up due to plugged heater core requiring dash removal on Audi S4

Some Audi S4 owners report experiencing issues with a plugged heater core that prevents the cabin from warming up, often necessitating dash removal for repairs. These issues can arise from low coolant levels or air in the cooling system, which may hinder proper heater function. Additionally, owners may encounter problems with clogged heater cores due to debris, sediment, or rust buildup, which can be exacerbated by a lack of regular maintenance. To address these concerns, some owners find it necessary to perform pressure tests, flush the heater core, or even temporarily bypass it. Ensuring the cooling system is full and properly bled is crucial for optimal performance. Regular maintenance, including flushing the cooling system and using coolant additives, is recommended to prevent future clogs and maintain heater functionality.