05/09/2026
🔥 Error of the month at Hella Gutmann!
Audi A4 2.7 TDI, built in 2008: The engine just wouldn't warm up – the display stuck at ~70°C. Thermostat replaced? No solution. Water pump replaced? Also no solution. 🤯
The hot tip came from our technical call center: suspected problems with venting or a defective coolant regulator on the EGR cooler. Bull's eye! The regulator was broken and blocking the circulation. Replaced, vented again – and everything was running smoothly. ✅
👉 Lesson learned: Always think about the coolant regulator!
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