Is it possible to inflate rear airbags on a non runner?

Aircon Andy

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2004 E320 cdi Auto
I need move my 2004 E320 cdi W211 whilst the injectors have gone for recon. Is it possible to raise the rear off the bump stops by inflating tthe airbags manually?
 

Ian Parkin

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w212 e250 CDi 2011 estate
Will it not lift up by turning ignition on?
I can tell you how to lift manually but it is complicated and you need a compressor to pump to 170-190 psi
 
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Aircon Andy

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Will it not lift up by turning ignition on?
I can tell you how to lift manually but it is complicated and you need a compressor to pump to 170-190 psi


Thanks for your reply Ian. No it won't raise just with ignition on. I have a 200 litre compressor but I think if will only go to about 120 psi max. I'm an airconditioning engineer so I have Oxygen free Nitrogen and can get up to 600 psi from it, I'd need to make an adaptor to get to a standard schreider but that won't be difficult. So your instruction would be most welcome.
 

V6Matty

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S212/10/E350(His) W169/2005/A180 (Hers)
IIRC there is a T connector near the rear axle you could remove the in pipe off this and then attach the compressor to this, not sure if the non return valves are after this point or not but it should allow you to inflait just a little to test and move.
 

Ian Parkin

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Right you need to get into the airline from front of the car to the rear airbags
On my model e320 estate its under the rear passenger seat on the near side under the carpet along with rear washer line and a bunch of wires. Its a 4mm nylon tube
You need to put a t junction in and then to your air supply.
On the other side (offside) theres 4 wires which go to the valves on top of the airbags you need to cut these determine which are pairs and then apply 12 v to each pair going to the rear of the car this will open the valve and allow you to pump each side up.
If you have 200 psi available you should be able to raise the car up
When you have finished its interesting to put a pressure gauge on the t junction so you can keep track of whats happening when you are driving...make sure it goes up to 300psi
 

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