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C280 trunk passenger side wall device?

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Old Jun 30, 2015 | 04:32 PM
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c230 & c280
C280 trunk passenger side wall device?
been having the battery drain on this car . when I opened up the trunk today I noticed a clocking coming from the right-hand side of the trunk behind the carpet . There is some device wrapped in phone with wires going to it that is clicking. Does anyone know what this is ?
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Old Jul 1, 2015 | 07:07 PM
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mbsickness
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1996 C36
Sounds like the vacuum pump that supplies the locks and I believe the climate control system.
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Old Jul 1, 2015 | 08:30 PM
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Pump
Any idea why it would be clicking even with car unlocked and trunk open and car off?
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Old Jul 2, 2015 | 10:18 PM
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mbguyw202
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1998 C230
Originally Posted by mrfuser
Any idea why it would be clicking even with car unlocked and trunk open and car off?
Does this noise occur when you lock/unlock the car?
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Old Jul 3, 2015 | 12:30 AM
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Even if just sitting there with trunk open and doing nothing it clacks

Originally Posted by mbguyw202
Does this noise occur when you lock/unlock the car?
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Old Jul 3, 2015 | 12:43 AM
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1998 C230
Originally Posted by mrfuser
Even if just sitting there with trunk open and doing nothing it clacks
It sounds like you have a vacuum leak somewhere. Before writing it off as this however, I would try to operate some of the power features. Lift up the rear head restraints, then push the button on the dashboard to drop them, try all the window switches and door switches, as well as the climate control duct switches, and power seats. Then I would check to see if any of the lines are being pinched, and if all else fails it might just be the pump you need to replace.
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Old Jul 3, 2015 | 01:21 AM
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Thanks for the info. This all started when the car wouldn't start. I replaced fuel filter as it seems rail not getting fuel and went into replace fuel pump when I noticed this sound. Could something with this coincide with no start problem?
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Old Jul 8, 2015 | 05:08 PM
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C280 Vacuum leak?
Found a vacuum line in trunk next to fuse box that seems to be unplugged from something. Can't see where it is supposed to go, if anywhere. Any ideas?

Thanks

Kelly
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Old Jul 8, 2015 | 10:57 PM
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Trunk vacuum
OK I looked in my other C2 30 and realize that vacuum line goes to the battery ! I have no idea what that's about ! Can anybody explain why a vacuum line would go to a battery ????

Originally Posted by mrfuser
Found a vacuum line in trunk next to fuse box that seems to be unplugged from something. Can't see where it is supposed to go, if anywhere. Any ideas?

Thanks

Kelly
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Old Jul 9, 2015 | 10:25 AM
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That is not a vacuum line to the battery, but a vent line for the battery gasses. Follow it and it will go down through the floor. Definitely needed to be hooked up correctly.
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