s211 airmatic relay

[DavidL]

I've done a bit of a search but I'm not exactly sure still. Where is this?
In the bonnet fuse box but which one?
Had the second instance (in 6 months) of what I think is the airmatic pump running after the ignition is off. Took the car for a quick spin but still the same but an hours run home and its fine. Just before I reached home I did get the up arrow malfunction but I'd been going an hour by then.
I get this very occasionally - once every 2 months or so and it tends to be when I accelerate from a slow moving bit on a steep uphil. Same today.
I've had the pump tested and all was well.
I wonder if the relay was stuck on? I gather this relay can be a bit iffy.
So first thing is find it!
Thanks

 

[guydewdney]

at the very back, nearest the windscreen, on its own little clip thing. outside the main box

normal 4 pin relay.

 

[DavidL]

Thanks Guy.
Did some digging and found a layout
Too many different part# for Airmatic relay on forum - MBWorld.org Forums

also other people with exactly my issue. Different model but same thing
Airmatic Relay Issue - MBWorld.org Forums

so I think a trip to the dealers is in order. I just hope I haven't damaged the pump. I can't imagine I'd have got all the way home with (almost) no issues but we shall see.

 

[DavidL]

Are main dealers the only option for new relays? I can't find anyone selling new relays other than the dealers.

 

[DavidL]

Just to update this:
Fuse box behind steering wheel under the bonnet, position S
Part nos
old 0025422319
new 0025427619

£10.77 from MB Salisbury.