The door assist vacuum pump on my s600 never stop running. With the accessory key in the on positoin and the engine off you can hear it cycle from the rear passenger seat. It cycles on and off every few seconds. The Mercedes Dealer couldn't figure it out. Mercedes recently replaced the pump. How do stop this from continuously running, or is this normal?

Thanks for any ideas!

You have a vacuum leak somewhere. Get out the mity vac and start testing for it!

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200