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Alright, finally managed to get some spare time and replace the auxiliary heater pump. On W211 270CDI it is located near the SBC block (not visible in the borrowed picture, it is a bit deeper). But the repair itself is not that difficult, took me about 30 minutes. It is just a bit hard to remove...

Cheers for the insights! :cool: I will look for a new aux heater pump and update this thread once I've made progress replacing it.

Hey there fellow drivers, so recently I have ran to this issue. To explain it as clear as possible, problem is that when car is standby (idling, not driving), heater blows cold air no matter what position it is in. When driving the car, all heater functions work as expected, hot air blows, but...