Quote:
Originally Posted by Boston Benz
The trunk is ajar about a half inch or so. I found a MB TSB stating to check the pneumatic pump under the rear seat to see if it makes any noise after closing the trunk. With the rear seat bottom out, I found the pump. It does make a whirring noise when the trunk is closed. The TSB says to look for the red vacuum hose which has probably come disconnected from the pump. The problem is there is no red vacuum line off the pump, only yellow and gray lines. Does this mean a new pump is needed? I hate this car.
|
In your 99 model, the central locking pump has nothing to do with closing the trunk. Closing is performed by the closing assist pump in the trunk.
Read all about it:
http://v12uberalles.com/Closing_Assist_Pump.htm
The central locking pump operates the trunk handle, and it also is responsible for releasing the striker eye in the trunk lid so that it is ready to be pulled in again by the closing assist pump to close the trunk. I'm unclear on the the exact situation on the earlier models, but I think the trunk handle used to be operated by the closing assist pump. I believe there was either a TSB or service campaign with a kit for switching the trunk handle operation from the closing assist pump to the central locking pump. I think the trunk closing has always been performed by the closing assist pump.
Brett