CLK430 2002 trunk?
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
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From: Boston North Shore
2001 CLK320 Cabrio
When you use the center console switch or the FOB, trunk unlocking is vacuum actuated (e.g. moves a lever, unlatching the strike plate).
When you use the metal key to open the trunk, after turning the the key 45 degrees counter clockwise, the same lever is moved manually, releasing the lock, when you then push the key inwards.
When you use the metal key to open the trunk, after turning the the key 45 degrees counter clockwise, the same lever is moved manually, releasing the lock, when you then push the key inwards.
Senior Member
Joined: Apr 2016
Posts: 279
Likes: 36
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First you try the metal key to rule out a mechanical problem in the latch. Careful with that, it could be stuck if the owner (I guess it's not you) has never used it.
If that works, the problem lies with the PSE Pump or the vacuum lines. Try to open the trunk with the button and listen for a "whirrrr" sound coming from the trunk. If you do hear it and it goes out after a few seconds (6 if I recall correctly), it's a vacuum leak. If you don't hear the sound at all, the pump is not spinning, meaning a faulty pump or electrical problem.
Rear head rests, central locking (+ fuel filler flap), ac vent flaps are all vacuum operated. A problem in one of them is generally a vacuum leak, a problem in all of them is generally a pump.
If pump is faulty disassemble and clean it first, before buying new/used one.
If that works, the problem lies with the PSE Pump or the vacuum lines. Try to open the trunk with the button and listen for a "whirrrr" sound coming from the trunk. If you do hear it and it goes out after a few seconds (6 if I recall correctly), it's a vacuum leak. If you don't hear the sound at all, the pump is not spinning, meaning a faulty pump or electrical problem.
Rear head rests, central locking (+ fuel filler flap), ac vent flaps are all vacuum operated. A problem in one of them is generally a vacuum leak, a problem in all of them is generally a pump.
If pump is faulty disassemble and clean it first, before buying new/used one.
