Pumping Noise from the back right side
07-24-2002, 12:41 AM
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Pumping Noise from the back right side
1995 C280
I hear a constant pumping noise from the right back side of the car. Opened the trunk and removed the wall cover and the noise seems to be from a pump looking think with a few hoses connected to it. It sounds like a fan motor turning on and off every 5 seconds none stop. Does anyone know what this is?
I hear a constant pumping noise from the right back side of the car. Opened the trunk and removed the wall cover and the noise seems to be from a pump looking think with a few hoses connected to it. It sounds like a fan motor turning on and off every 5 seconds none stop. Does anyone know what this is?
Last edited by systemguide; 07-24-2002 at 12:45 AM.
07-24-2002, 04:15 AM
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1995 C280 & 2002 CLK320 Cabrio
That is the vacuum pump. This pump controls the central locking system. It should only activate when you are unlocking or locking the doors. If there is a leak in the system... it will run for 5 or so seconds, and then time out.
If it's running constantly every 5 seconds... then I'd wonder what is up. Please be more specific with the symptoms! Thanks and good luck!
If it's running constantly every 5 seconds... then I'd wonder what is up. Please be more specific with the symptoms! Thanks and good luck!
07-24-2002, 09:42 AM
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red bicycle
Hey,
Is this similar to the noise I described in my post?
https://mbworld.org/forums/showthread.php?s=&threadid=12355
Todd
Is this similar to the noise I described in my post?
https://mbworld.org/forums/showthread.php?s=&threadid=12355
Todd
Last edited by whatup?; 07-24-2002 at 09:45 AM.
07-26-2002, 04:36 AM
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1995 C280 & 2002 CLK320 Cabrio
The vacuum pump is located behind the trunk liner (in the trunk...!) on the passenger side. Looks like this:
Mine would run for 5 or so seconds longer than normal (1-2) seconds when unlocking the doors... it turned out to be a leaky door actuator. I could hear the air escaping from the rear door upon unlocking, in congruence with the vacuum pump running.
Good luck!
Mine would run for 5 or so seconds longer than normal (1-2) seconds when unlocking the doors... it turned out to be a leaky door actuator. I could hear the air escaping from the rear door upon unlocking, in congruence with the vacuum pump running.
Good luck!
07-26-2002, 12:57 PM
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red bicycle
Hey,
Thanks for your response. Since we're hearing sounds from the pump, does it need to be replaced?
I think we had it replaced two years ago when my rear defroster stopped working. The dealer replaced free of charge, even though my C went off warranty a month before. Otherwise, it was a $1000 part. But I may be mistaken for which part was replaced...
Todd
P.S. I posted this board in the Tech Talk forum too.
Thanks for your response. Since we're hearing sounds from the pump, does it need to be replaced?
I think we had it replaced two years ago when my rear defroster stopped working. The dealer replaced free of charge, even though my C went off warranty a month before. Otherwise, it was a $1000 part. But I may be mistaken for which part was replaced...
Todd
P.S. I posted this board in the Tech Talk forum too.
07-27-2002, 06:37 AM
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1995 C280 & 2002 CLK320 Cabrio
I highly doubt that the problem lies within the pump itself. There is (more than likely) a vacuum leak or an electrical glitch of some sort.
Can you be more specific? Any patterns?
Can you be more specific? Any patterns?
