Electrical motor running noise in rear area of vehicle after engine shutdown and key removal. occurs every time vehicle is driven in rain conditions--regardless of severity of rain. the noise remains for up tp 15 minutes after shutdown and key removal and occurs only in wet conditions. first time there was an acrid odor at the time of the noise -- appears to have ceased subsequently but the "running" noise remains. only when driven in the rain. vehicle appears to be normal in all aspects when driving in dry conditions. have had authorized vw dealer inspect with no results. it is important to note, regardless, that this occurs every time it rains. the only motor i can think of in the rear area is the fuel pump and have no idea why this occurs. situation has been with the car since original purchase in october 2017.