Had my S8 2001 in for a service today,asked them to look into similar problem.Advised that it is the heater matrix pump,needs replacing,as the part costs over £500 going to leave until heater packs up,real bummer.If you hear where we can get cheaper please let me know.
Just the reason I hate taking cars for a service,nothing straight forward, and this after having rear diff seal go. Only done 20k. Good luck.
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