Question about 2001 Mercedes-Benz S-Class

1 Answer

The airmatic pump seems to running constantly, and can be heard from inside the car. When I engage the airmatic system, that is when I call for the car body to rise, i get the display on the dash saying vehicle rising, with the correct diagram and sometimes the vehicle does not rise, and then when it does there is quite a loud whirring which seems to be coming from under the dash, but maybe in the engine bay, it's difficult to say especially when you are sitting in the car with the engine running, some times while driving along this whirring noise will suddenly start and then stop after a minute or so, all completely at random. Any Ideas?

Posted by on

  • yadayada
    yadayada Mar 12, 2011

    How many miles on the car?

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 643 Answers

Reason is likely inadequate air in the system. This can be due to:

Pump failure.
Valve failure.
Sensor failure.
Significant leak from system.

System is usually VERY reliable but at high mileage (lets say 100k miles+) things can become troublesome...and potentially VERY expensive.

All depends how DIY / competent you are.

Best course of action is to get your friendly MB dealer to run an SDS Quick Check which will advise any DTC's (Diagnostic Trouble Codes) that have been set. This should point us in the right direction. You should get a PRINTED report showing the status of all vehicle systems. If the car is several years old you may be horrified by how many codes have been set and stored!!
If you have any "goodwill" with the dealer they may do this Free of Charge but usually charge â£25 (maybe more in London).
Unless you have deep pockets I would suggest you get that info first.

The pump is located under the RH frond wheelarch. It makes (should) a noise when running. If there is no noise then no air pressure. A new pump is circa â£250 + fitting but there are many reasons why the pump may not be running. Fuse / Circuit issues / sensor values / worn out etc.

If the pump is running the valve block can sometimes fail to deliver the correct pressure to one, or several, of the corners of the car and your observation front OK, rear low may fit here.

In the States leaks are quite common on the large engined variants operating with high under bonnet temps (London traffic?). This causes cracking of the seal at the top of the struts. A kit is available in the USA to fix this (non MB I suspect) but new struts are mega expensive. The crack (if present) is clearly visible around the top of the strut adjacent to where the air tube enters.

I could go on but the first step is the codes and an indication from MB (if they are prepared to do so) of what they think is wrong and the likely cost)

I experienced a fault on my S Class (which somebody else also encountered on this site) whereby the salt on our roads had corroded a wire splice WITHIN the harness adjacent to the pump and this gave INTERMITTENT "Too Low" warnings" and "Stop do not Drive" messages over several years but usually cleared after a restart or two. It was when it didn't clear that i had to determine the cause. My MB garage were intrigued by this issue because they were confident that it was the pump.
They actually fixed the problem for a mere â£70 after spending 8 hours!! on the car with me present because I "bet" them that it wasn't the pump. (I had already satisfied myself that everything in the system was OK and had run out of ideas. I hadn't even considered a broken wire within the harness! I took it to them because I needed to codes..I don't have the required equipment to read suspension codes... to help me move forward)
SDS indicated "Pump failure" because the pressure sensing signal which is generated by a sensor mounted on the pump was not being seen by the computer. It wasn't being seen due to the break in the wire!

Posted on Mar 12, 2011

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2010 MKX makes high pitch noise. can be heard inside and outside the car. What is it & How can I fix it?


This is just a guess but I can think of only two things to check.
Exhaust system has a small leak.?
Or fuel pump is about to fail.?

Jul 15, 2014 | 2010 Lincoln MKX

1 Answer

Sporatic clicking/scraping sound


SOUNDS TO BE A CV JOINT(CONSTANT VELOCITY JOINT) ALSO HAVE BRAKES CHECKED FOR POSSIBLE LOOSE OR WORN PARTS

Jun 24, 2013 | Cars & Trucks

1 Answer

1994 Ford Taurus GL 3.0L will not start. Cooling fan and fuel on constantly with key In "on" position. Has new relay control module. Check engine light does not come on when key is on.


I have always heard that a constantly running fuel pump and cooling fan is an indicator that your ecu is going bad, horrible words to hear i know but definitely do some research on this and if it is the problem luckily there are decent finds in scrap yards to be had for little money. hope this helps and sorry about the bad luck :(

Jan 29, 2013 | Cars & Trucks

2 Answers

Mercedes s430 2000 i constantly get message airmatic go to workshop , front right suspension seems to be faulty , can it be fixed or does it need to be changed ?


It will have to be tested at a dealership. It is most likely the strut assembly, but occasionally the air pumps go bad.

Jan 27, 2013 | 2000 Mercedes-Benz S-Class

1 Answer

Mercedes s430 airmatic, car too low


my problem is airmatic stop car too low

Sep 28, 2012 | 2000 Mercedes-Benz S-Class

1 Answer

Fuel pump wont shut off


Read page 19 of your owners manual. It's supposed to run about 5 hours after the car is shut off. I heard the same noise and googled it and found a response in one of the blogs. It's supposed to be an "Evaporation Leakage Check"?? To me, this seems to be something Toyota added to cover up a problem they found in their fuel system. Once you turn the key on and off, it will shut off, but likely will come on in another 5 hours.

May 05, 2012 | 2012 Toyota Camry

1 Answer

2003 for expedition. I have a continuous clicking sound coming from the back of my SUV. Its not the heater door because that has already been fixed and the noise is constant when the tuck is running. It...


the fuel pump is in the tank but if it gets loud enough it can be heard inside the car. try take off the gas cap and putting your ear to the tank and see if sounds like it is coming from within

Apr 07, 2011 | 2003 Ford Expedition

1 Answer

Can not get car to rise or lower car sits on wheels


possibly faulty airmatic pump for suspension, first open boot and boot floor mat then have look on spare wheel, you can see your tools extra fuses and fuse diagram on it, take fuse diagram and read it you can find what's the fuse no and fuse box where is the airmatic pump fuse and relay is, check fuse and relay first, if the fuse blown replace same fuse for that now you know where are the extra fuses, get one from that, start engine is the car not rise up operate the switch above the radio still not working either faulty airmatic pump or control unit, you can check pump yourself turn steering fully left, remove clips from bulkhead inside wheel arch only need to remove front section then have a good look inside you can see airmatic pump is hanging on chassis rail under the right head light, have a good look wires on pump if it dried and broken that's the fault, only solution either repair pump or replace new pump. if not the faulty pump you have to get diagnose the car by experience technician, is this information helped you?

Oct 25, 2010 | 2000 Mercedes-Benz S-Class

1 Answer

I have the car to low error message on the display the bags are bottomed out and wont raise up. its on a e 500 2003


The suspension has a leak somewhere and/or the airmatic compressor has stopped working properly. You need either the Mercedes star diagnosis system (SDS) in order to access the suspension control module to tell it to raise the vehilce or you can try to trick it by jacking up the car so it thinks it's sitting at the correct ride height. But as long as the display reads a warning it won''t allow the airmatic compressor to run.

Oct 12, 2010 | Mercedes-Benz 500-Class Cars & Trucks

Not finding what you are looking for?
2001 Mercedes-Benz S-Class Logo

488 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

yadayada
yadayada

Level 3 Expert

76846 Answers

Michael Contreras
Michael Contreras

Level 2 Expert

166 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...