The Touareg works with four air springs and one central compressor. The rubber bellows of the air spring cracks over time, the system loses pressure, and the compressor tries to make it up by running more and more, until it burns out. The symptom is typically that the car settles overnight, or stands lopsided.
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The fault goes in a circle: the leaking air spring is what kills the compressor, so if only the compressor is replaced, the next one goes too. A full overhaul is four springs plus a compressor plus a dryer, and that is the most expensive routine repair on a Touareg.
What to check
- Look at the car cold, after standing a night: has it settled
- Raise it to the highest, then the lowest setting, and time it
- Listen to the compressor: a unit running long or loudly is already tiring