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Old 11-24-2007, 08:24 PM   #1 (permalink)
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Vehicle: 2002 S430/ 1997 C280
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Need info on air pump relay

New to the S-Class model, I have researched this forum and found it very helpfull. I would like to know the location of the airpump relay that everyone is talking about for the suspension. My model is a 2002 S 430, any info would be greatly appreciated.
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Old 11-24-2007, 10:20 PM   #2 (permalink)
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Hello, welcome to the forum.

The relay is located in the right side fuse box, under the bonnet.
There are two square-looking black relays located about in the middle of the fuse box, (a little bit towards the front direction). The relay is the one wich is closest to the front of the car of the two.

If you pull the relay you should get an airmatic failure message when you start the car. (to check if you found the correct)

Part no on the relay is 0025421319
Vendor is now HELLA, was before Siemens.

You can get it cheap from here:

Your Parts Search Returned 2 Part(s)

Change it asap if you find that the Siemens one is still on the car...

rgds
Odd

Last edited by Oddemann; 11-24-2007 at 10:24 PM.
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Old 11-25-2007, 01:35 AM   #3 (permalink)
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Thank You

Thanks for the info!!!
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Old 11-25-2007, 12:47 PM   #4 (permalink)
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Quote:
Originally Posted by Oddemann View Post
Hello, welcome to the forum.

The relay is located in the right side fuse box, under the bonnet.
There are two square-looking black relays located about in the middle of the fuse box, (a little bit towards the front direction). The relay is the one wich is closest to the front of the car of the two.

If you pull the relay you should get an airmatic failure message when you start the car. (to check if you found the correct)

Part no on the relay is 0025421319
Vendor is now HELLA, was before Siemens.

You can get it cheap from here:

Your Parts Search Returned 2 Part(s)

Change it asap if you find that the Siemens one is still on the car...

rgds
Odd
hi Odde,
is this going to be same part for 2002 S500?
this is good information though, thanks.
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Old 12-08-2007, 12:26 PM   #5 (permalink)
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i checked mine the other day and the relay was tyco.
should i change it?
02 s500
thanks
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Old 12-09-2007, 03:40 AM   #6 (permalink)
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I am no mercedes specialist.
Ihave only seens siemens and hella mentioned on the net, but maybe others are also making this kind of relay.

The most important thing i that you know where the relay is located and are able to pull it out if it gets stuck in the ON postition. In the on position the compressor will run all the time even with the ignition off and it will burn out.
Also if compressor starts to run for longer periodes with a good reason to do so (air leak for example) it could be the relay is getting damaged.

I have also heard that the relay could get damaged from and old compressor starting to draw to much current.

Also if you get a major leak in the airmatic system and compressor runs all the time, its possible to pull the relay to save the compressor.

Weather you should change the relay or not depends on how much know the car and its normal behaviour. These relays are the same for all W220 airmatics whatever model.

With about 16$ from autohaus arizon not a big deal to exhange it, but it will not fix that leaky top seal strut problems..

Rgds
Odd
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Old 12-10-2007, 03:06 PM   #7 (permalink)
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Quote:
Originally Posted by Oddemann View Post
I am no mercedes specialist.
Ihave only seens siemens and hella mentioned on the net, but maybe others are also making this kind of relay.

The most important thing i that you know where the relay is located and are able to pull it out if it gets stuck in the ON postition. In the on position the compressor will run all the time even with the ignition off and it will burn out.
Also if compressor starts to run for longer periodes with a good reason to do so (air leak for example) it could be the relay is getting damaged.

I have also heard that the relay could get damaged from and old compressor starting to draw to much current.

Also if you get a major leak in the airmatic system and compressor runs all the time, its possible to pull the relay to save the compressor.

Weather you should change the relay or not depends on how much know the car and its normal behaviour. These relays are the same for all W220 airmatics whatever model.

With about 16$ from autohaus arizon not a big deal to exhange it, but it will not fix that leaky top seal strut problems..

Rgds
Odd
thanks, for advice odde.
its good to know where it is like you said if needed in emeregency.
so far i don't have problems with compressor. there is one small crack on the left top strut seal though.
i probably will get the new relay together with front brake rotors. just wanted to know if i need to hurry since siemens had problematic relay originally.
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Old 06-06-2008, 05:03 PM   #8 (permalink)
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How do you change the relay? Do I need to disconnect the battery?

Thank
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Old 02-25-2010, 05:19 AM   #9 (permalink)
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Date registered: Oct 2007
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also new to 220

hi:

have 2000 s430...previously owned 126s (3x)
I am in third year...love this car...replaced shocks with ARNOTT rebuilds...fantastic ride (and relay of course)...pump still good

need help with following please:
passenger side wiper stopped working on trip this week....would come up and not return...removed arm assembly from car to arrive safely in Toronto
Center pivot turns but right one can be spun with finger pressure.

I peeked under plastic moulding at base of windshield and saw a white/grey pot metal cast box from which wiper pivots protrude...is this what I need to replace? what is part number? Am I on right track?

thanks for help

glenn g
montreal, qc
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Old 04-16-2010, 05:03 PM   #10 (permalink)
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Date registered: Feb 2008
Vehicle: 02 S500 Sport
Location: NYC
Posts: 42
Quote:
Originally Posted by Oddemann View Post
I am no mercedes specialist.
Ihave only seens siemens and hella mentioned on the net, but maybe others are also making this kind of relay.

The most important thing i that you know where the relay is located and are able to pull it out if it gets stuck in the ON postition. In the on position the compressor will run all the time even with the ignition off and it will burn out.
Also if compressor starts to run for longer periodes with a good reason to do so (air leak for example) it could be the relay is getting damaged.

I have also heard that the relay could get damaged from and old compressor starting to draw to much current.

Also if you get a major leak in the airmatic system and compressor runs all the time, its possible to pull the relay to save the compressor.

Weather you should change the relay or not depends on how much know the car and its normal behaviour. These relays are the same for all W220 airmatics whatever model.

With about 16$ from autohaus arizon not a big deal to exhange it, but it will not fix that leaky top seal strut problems..

Rgds
Odd
Bump from the dead, my relay bugged the hell up and ran my pump to death...Thx for this post it cleared alot up for me.

Pump Crapped Out - MBWorld.org Forums

I will be buying the relay as well.
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