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Replacing Your Trunk Vacuum Actuator - Mercedes Benz
 
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Pelican Technical Article:

Replacing Your Trunk Vacuum Actuator - Mercedes Benz

Steve Vernon

Time:

1 hour1 hr

Tab:

$190

Talent:

*

Tools:

8mm wrench, pliers

Applicable Models:

 
Mercedes-Benz W124 (1986-95)
Mercedes-Benz W126 (1981-91)
Mercedes-Benz W201 (1984-93)

Parts Required:

New trunk lock actuator

Hot Tip:

Be careful with old vacuum lines

Performance Gain:

Working locks

Complementary Modification:

Replace your trunk seal

Of all the vacuum actuators in the Mercedes-Benz W201, the trunk actuator is the easiest to replace. The hardest part of the job is climbing in the trunk so you don't have to strain your neck to see where you are working.

With the trunk open, hop in and have a seat. Now look up! You will see the lock mechanism and the actuator.

The lock mechanism is attached to the actuator by a metal rod. To replace the actuator you must first remove the rod. The rod sits in a black sleeve inside a sliding sleeve. Hold the rod and sleeve in place while sliding the compression part of the actuator back towards the actuator body, then simply pop the rod out of the sleeve.

With the rod free, loosen, but do not fully remove the two screws holding the actuator in place.

Feed the actuator out through the access hole in the trunk.

Disconnect the lines and then reconnect the lines to the new actuator. Do not forget to reinstall the screws half way before putting the new unit back into the trunk.

Installation is reverse of removal.

Figure 1

On the under side of the trunk you will see the vacuum actuator (yellow arrow) and the lock mechanism (red arrow)

While holding the rod (green arrow) and black sleeve (yellow arrow) in place, slide the compression sleeve back (red arrow), then pop the metal rod from the black sleeve.
Figure 2

While holding the rod (green arrow) and black sleeve (yellow arrow) in place, slide the compression sleeve back (red arrow), then pop the metal rod from the black sleeve.

Loosen but do not fully remove the two 8mm screws holding the actuator (green arrows).
Figure 3

Loosen but do not fully remove the two 8mm screws holding the actuator (green arrows).

Remove the actuator from the trunk, remove lines (red arrows) and replace.
Figure 4

Remove the actuator from the trunk, remove lines (red arrows) and replace.

Remove the two 8mm bolts (red arrows) holding the locking mechanism in place.
Figure 5

Remove the two 8mm bolts (red arrows) holding the locking mechanism in place.

Remove from the trunk and be sure to check the gaskets (yellow arrow).
Figure 6

Remove from the trunk and be sure to check the gaskets (yellow arrow).

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Comments and Suggestions:
DanaR Comments: I just bought a 1990 mercedes 190e. The drivers door lock will not lock or unlock using the key and tries to go down when I push down rhe passenger lock but does not go down. Also the trunk stays locked. I can unlock with key only and it will not stay unlocked. Can you tell me what to check and where first please?
April 9, 2016
  Followup from the Pelican Staff: That may be due to a faulty switch for the lock cylinder. I would start there. - Nick at Pelican Parts  
Arska Comments: I need to change just my lock cylinders, any other tips to the lock cylinder on trunk?
April 6, 2016
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
sherman_o Comments: I use to turn the key in the trunk lock to lock the whole because my driver door lock cylinder is worn out. however, today the trunk cannot lock the whole car anymore.
February 13, 2016
  Followup from the Pelican Staff: Sounds like the electrical switch failed. I would remove the lock cylinders and inspect the wiring and microswitches. - Nick at Pelican Parts  
Katie Comments: When I unlock the door of my Benz 1990 300E then open the trunk I hear a hissing in the right rear wheel well. This only happens after I have unlocked the door then the trunk. What is it?
August 7, 2015
  Followup from the Pelican Staff: Could be a leak in the vacuum system for the door locks. Inspect the area of the noise for a broken line. - Nick at Pelican Parts  
Ben Comments: Hi I have a 85' Benz 190e that when the key is inserted to lock the trunk the key wont turn at all and sometimes gets stuck in the trunk lock. Is it due to a bad trunk vacuum actuator?
June 15, 2015
  Followup from the Pelican Staff: Probably a bad lock cylinder or worn out key. Do you have a second key to try? - Nick at Pelican Parts  
Sherif Comments: Which oil is better for my 93 190E 2.3 -- Mobil 1 5W30 or Pennzoil Platinum Plus 5W30 --both are synthetic. Thank you.
October 9, 2014
  Followup from the Pelican Staff: I prefer Mobil 1. However, this is just my preference and can't say which is best for your vehicle. If it is approved by Mercedes-Benz, it will be fine. - Nick at Pelican Parts  
250TD Comments: my vacum acutator is not under the lid but is in the locking part the one on the chassis and sometimes central locking does not close the trunk, could you guys help me out by posting some pic so i can remove and possibly fix it.
thanks
October 5, 2014
  Followup from the Pelican Staff: You didn't mention what vehicle you have. I may be able to look up the location. it is unlikely I will have a photo to share. - Nick at Pelican Parts  
scicarelli Comments: Why I open the trunk if the truck lock is not open I try with master key and nothing happened..
September 29, 2014
  Followup from the Pelican Staff: Are you saying the key won;t unlock the trunk? Does the lock cylinder rotate? - Nick at Pelican Parts  

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