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It's not true that the aux pump only runs when heater is on. My car lived the first 5 yrs of its life in the UK and came to Malaysia with 40k kms. The past 10 yrs / 120k kms in Malaysia the heater has never been switched on as it's always hot here, so a/c only 100% of the time. Yet I got A6D1 aux pump error couple years ago and had to replace the aux pump. When I opened up the old aux pump, the carbon bushes were completely worn down and there was carbon dust all over the insides. So the aux pump definitely is still working even when heater is not switched on.
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