Land Rover Repair: rear suspension system, rear suspension system, subzero temperatures

Question
hi john,

i recently sent you these two questions:
"Expert: John Robison
Date: 2/5/2007
Subject: rear suspension system

Question
I was just that there's a possibility that there might be ice in the valves and that is why it is sinking.  If this is the case, what are my options?  
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The text above is a follow-up to ...

-----Question-----
Does extremely cold temperatures effect the rear suspension system in a 2000 discovery?  I just had the rear air springs replaced two years ago.  After my car sits in subzero temperatures overnight, the rear of the car lowers.  But, once the engine is turned on and the car warms up, it raises again.  could there be another leak?  Thanks.
-----Answer-----
Something is leaking or worn out.  I'd suggest you consider a coil spring conversion, otherwise you will just keep throwing money at it.

Kits are available from Atlantic British, 800 533 2210 or Rovers North 802 879 0032

Answer
If that is the case you can simply wait for warmer weather.  There are de-icers sold for air brake systems in trucks but we dont use them where I live.  A service facility could empty the tank and put in de-icer if that's what you want to try.  I don't think you should try that yourself because you need to empty and then refill the air tank, and I think you'll need the Land Rover test system to accomplish that.  I say "think" because the only way I've ever done that is via the tester and I am not certain if you could try it on your own but in any case I would not recommend it because if the system loses air it will be flat on the bump stops till you visit the dealer. "

well, i went and replaced both rear air springs.  the morning after i got my car back, the rear was lowered again.  when i turn on my engine, the car goes right back up.  i spoke with someone at landrover and he told me that there's a good chance the rubber springs are settling in and haven't completely sealed themselves up yet.  and that once the temperatures go up, this should happen and it'll be okay.  do i go ahead and wait?  

Answer
Well, Debbie, my suggestion about waiting for warm weather was not without merit.  Lots of air suspension problems show up at -10 and vanish at +30

There is a drier in the air tank that you could have replaced by your dealer or LR specialist but the cost of any such service will equal the cost of conversion to coil springs.

That's why most people convert when things start to break.  You can't really do much to repair the air suspension on your own - you need the LR test system