Something draining the battery on a 1992 VW Caravelle T4.
We have 1992 VW Caravelle 2,5 L petrol. Something is draining the battery, we don't know what it is. But there is a sound from the enginge compartment. It sounds like it could be a pump or something, we have checked out if if could be a fan, but have ruled it out. Does anyone know what could be wrong? This "malfunction" drains the batery in a little under 3 weeks. We first noticed this noice in march.