On mine One of the Door Actuators has a leak and also the Main Lock Vacuum Switch on the Drivers Door. That was enough to keep the Trunk from opening reliably and I have no Trunk Key at all.
Replace the bad Vacuum Parts parts and everthing functions as it is supposed to.
The Vacuum Lines that go to the Trunk and Fuel Door Actuator are on the Right side of the Car on the front Floor under a removabel Plastic Channel. If you dicsconnect the Lines there you can reconnect them later without haveing to open the Trunk; like in case you loose your Trunk Key.
Pic borrowed from another Member.
Were it said got lost is the lines for the Fuel Fill Door and the Trunk.
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84 300D, 82 Volvo 244Gl Diesel
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