i have a 99 A4 the door locks only lock and unlock manually, either with the key or opening the inside door handle and pushing the pin down to lock. i removed the trunk liner to get to the vacuum pump and i hear it operating but i do not know if it is working properly and i just have a issue in one of the vacuum lines. anyone know how i can test the pump itself to know if its good or bad?
How do i test the vacuum pump?
thanks for your help