Suspention low front and back

[VillHamp]

Hello again!

I have a new problem, similar to an earlier problem. Some time ago I had the car low on back wheels. It was a faulty suspension hose. It was a quite quick fix. Now when changing to summer tires something similar happened again, but both front and back. I sentenced a smell, some smoke, turned of the car (high to add a floor jack - lower to get the tire clear).

I looked under the car and saw tripping right front under reservoir. When lowering the car when to "ultra low" mode=).

I looked under the hood, and felt the reservoir cap, it was slightly un screwed, can it be the issue. It was a lot of fluid on top of the reservoir. Higher pressure when lowering and car only on two wheels?

Best regards,

// Vilhelm

[Gibbo2286]

There is a procedure for lifting/jacking somewhere on the forum, Can't remember where but here is a label that was offered.
download/file.php?id=13457&mode=view

[Kees]

If you don't put the car in the highest position before you jack the car up, you get the problem, that to much LDS fluid return to the tank, wich end up with a spill out of the tank when you lower the car.
Also because of this spill can destroy youre pomp because the fluid makes a short in the elektronica.
First you check the LDS level in the tank, and check the 40 Amp fuse in the fusebox behind the left head lamp.
Greeting,
Kees.

[VillHamp]

Hello.

Thanks all for your anwers.

But is it not so, that the car should be on lowest setting when adding/tipping up oil? Why does it then "spill over" when lowering the car? Can it be that the mechanic working on the car when I had a broken hose didn´t putt it on low filling up, and therefore spilling over on low?

// Vilhelm

[Kees]

Partial, you're right. But even when the control of the LDS fluid level is done correctly, and there is not to much of LDS fluid in the tank it's still possible, that the tank burst when they jack him up the wrong way, the reason is, that when the wheels hang loose in the air, the electronics system think, the car is standing to high and therefore opens the return valves in the BHI, and let the fluid runs freely in the tank.
Now if you than put the car down, the struts goes suddenly from the highest position in to the lowest.
The remaining fluid goes under pressure back to the thanks and if the cap is not twisted loose the chance will be, the tank burst.
By the way, you can prevent this to happen, by just disconnecting the battery.
This how I do it sometimes without put the car in the highest position, because the valves I'm talking about before stay close, because there's no power to open them.
Greetings.
Kees.

[PaulC5]

Have you looked in the handbook to see what it says about jacking the car up. In our 2007 C5 one I am sure it says to raise the suspension to max before jacking up and once back on the ground to lower the suspension from max. No where does it say to alter the suspension height whilst jacked up. On the X7 C5 you also have to slacken the LDS tank cap before jacking up to avoid the tank splitting and only tighten it once back on the ground but this does not seem to be in the handbook.

The following is from page 214 of the last C5 X7 handbook 1/8/2016

Before positioning the jack:
- Always adjust the vehicle’s ground
clearance to the "maximum height"
position and retain this adjustment
for as long as the jack is under the
vehicle (do not use the hydraulic
adjustments),