Does the central locking pump run on for an extended period of time when you lock or unlock the car?
The pump (?) thingy that you reference is the vacuum operated bit of the locking for the boot which is seperate from the electric boot release via the button on the drivers sill or the central button on the key. The vacuum (or pressure) created by the central locking pump pulls or pushes to lock or unlock the boot so if it isnt moving when the locking or unlocking is activated then I can only assume that the air is being lost somewhere. This would however result in the pump running on longer than the usual 1-2 seconds.
For the purpose of testing the locking on a D2 can be opened or closed using your mouth and sucking or blowing (this is going downhill rapidly isnt it!) and as such should move the bellows on the boot lid in or out....
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