the bottom line w the AIR suspension is SIMPLE:
#1
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THIS CAT DOES NOT WANT TO COME OUT AND PLAY IN COLD TEMPS.... I notice that once the weather drops under 40f I get all sorts of suspension warnings and the front drops low... But above those temps NOT A WARNING LIGHT OR DROP IN SIGHT !!!!!!!!!!!!!! its 25f outside in NY and I went to start her up to make a midnight food run and low and behold the suspension is on the floor and the red warning light comes on .... after about 10 minutes and 4 blocks later the car warms up the suspension goes up and the light goes away to go f#$k its mother..... Im so frustrated that no one can even find the damn problem. Its amazing the lack of enthusiasm and knowledge on these cars... Now I'm forced to go to New Jersey to drop the car off .... What a joke... but its definitely the cold weather... the noise goes away when its warm as well which has me 99% convinced the problem is the air suspension motor.. though it all I refuse to let the ineptitude of others ruin the experience of owning this car.. She is quickly becoming the best and most favorite automobile I've owned in my 37 yrs on this planet #frustrated a little .....
#2
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I reckon you need a replacement air compressor from the sound of it.
I have yet to work out how the water trap in the compressor is emptied, but suspect it is done by the system blowing some air through the dessicant after a journey, because I hear air exhausting at the front of the car when I stop, but the suspension stays the same height. I surmise that if this blowing out fails to work properly, the dessicant trap will eventually get saturated and then let water into the system, which can then freeze in awkward places.
I have yet to work out how the water trap in the compressor is emptied, but suspect it is done by the system blowing some air through the dessicant after a journey, because I hear air exhausting at the front of the car when I stop, but the suspension stays the same height. I surmise that if this blowing out fails to work properly, the dessicant trap will eventually get saturated and then let water into the system, which can then freeze in awkward places.
#3
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I too, as an engineer, wondered how the dessicant is renewed as I could pour the water out of the one I dissassembled.
I reckon you need a replacement air compressor from the sound of it.
I have yet to work out how the water trap in the compressor is emptied, but suspect it is done by the system blowing some air through the dessicant after a journey, because I hear air exhausting at the front of the car when I stop, but the suspension stays the same height. I surmise that if this blowing out fails to work properly, the dessicant trap will eventually get saturated and then let water into the system, which can then freeze in awkward places.
I have yet to work out how the water trap in the compressor is emptied, but suspect it is done by the system blowing some air through the dessicant after a journey, because I hear air exhausting at the front of the car when I stop, but the suspension stays the same height. I surmise that if this blowing out fails to work properly, the dessicant trap will eventually get saturated and then let water into the system, which can then freeze in awkward places.
#4
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It's called adiabatic expansion.
The air is depressurised rapidly and periodically which causes water to be removed from the dessicant.
In adiabatic process heat is neither added nor removed from the system. So the work done by the system (expansion) in adiabatic process will result in decrease of internal energy of that system (From I st law). As internal energy is directly proportional to the change in temperature there will be temperature drop in an adiabatic process.
The gas cools below the dew point and free water is formed which is "blown" out.
Bob
The air is depressurised rapidly and periodically which causes water to be removed from the dessicant.
In adiabatic process heat is neither added nor removed from the system. So the work done by the system (expansion) in adiabatic process will result in decrease of internal energy of that system (From I st law). As internal energy is directly proportional to the change in temperature there will be temperature drop in an adiabatic process.
The gas cools below the dew point and free water is formed which is "blown" out.
Bob
#5
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Jaguar's description is as follows:
Air drying: An integral air-drier maintains a low-moisture environment inside the suspension’s pneumatic system.
Desiccant in the drier removes moisture from high-pressure air as it is pumped into the suspension system. Air vented from the suspension system flows over the desiccant at low pressure, removing moisture from the desiccant and returning it to atmosphere.
This regenerates the desiccant so it can remove moisture during subsequent compression cycles.
Originally Posted by Jaguar
Air drying: An integral air-drier maintains a low-moisture environment inside the suspension’s pneumatic system.
Desiccant in the drier removes moisture from high-pressure air as it is pumped into the suspension system. Air vented from the suspension system flows over the desiccant at low pressure, removing moisture from the desiccant and returning it to atmosphere.
This regenerates the desiccant so it can remove moisture during subsequent compression cycles.
#6
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Yes, that is the exact text from the X350 Technical Notes of 2003 that I have.
It would seem to explain why I get this burst of air after turning off the engine and parking up. However, I would expect it to do it continually during a journey, but obviously we can't hear it whilst driving if it it being done.
It would seem to explain why I get this burst of air after turning off the engine and parking up. However, I would expect it to do it continually during a journey, but obviously we can't hear it whilst driving if it it being done.
#7
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#13
#14
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I had the same problem and replaced the compressor as well as the front air struts with the Arnott units. I can not believe how good my suspension now behaves. It actually feels more compliant and with better control than I can ever remember. I am enjoying my 2005 XJR all over again!
#15
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I had the same problem and replaced the compressor as well as the front air struts with the Arnott units. I can not believe how good my suspension now behaves. It actually feels more compliant and with better control than I can ever remember. I am enjoying my 2005 XJR all over again!
Thanks
#17
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jasedita 74,
Try pulling the air lines, removing the collets, then pull & replace the 'O' rings that the collets lock into place. The high tech soapy water detection of the leaks would suggest that when the existing 'O' seals are cold, they are not gripping & sealing properly. It's a long shot, but perhaps as the engine bay temperature warms up the air, they are becoming pliable enough to provide a managable seal. Age certainly does harden them up. Although not a factory recommedation, I have also used a very light smear of silicon swimming pool pump filter cap sealant when reassembling just to ensure a good seal. The other thing to do is to look closely at the ends of the air lines themselves, for any longitudinal scratches, or annular compression around them where they 'bed' into the 'O' rings. If there is, trim a short amount off the ends, and very gently rotate a pencil sharpener around the fresh cuts to bevel them before reinserting them into the air suspension bag.
Cheers,
Languid
Try pulling the air lines, removing the collets, then pull & replace the 'O' rings that the collets lock into place. The high tech soapy water detection of the leaks would suggest that when the existing 'O' seals are cold, they are not gripping & sealing properly. It's a long shot, but perhaps as the engine bay temperature warms up the air, they are becoming pliable enough to provide a managable seal. Age certainly does harden them up. Although not a factory recommedation, I have also used a very light smear of silicon swimming pool pump filter cap sealant when reassembling just to ensure a good seal. The other thing to do is to look closely at the ends of the air lines themselves, for any longitudinal scratches, or annular compression around them where they 'bed' into the 'O' rings. If there is, trim a short amount off the ends, and very gently rotate a pencil sharpener around the fresh cuts to bevel them before reinserting them into the air suspension bag.
Cheers,
Languid
#18
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Languid,
That was excellent information!![Icon Clapclap](https://www.jaguarforums.com/forum/images/smilies/icon_clapclap.gif)
(Seem like the same procedures as repairing Air Brake Systems.)
Added: My left front had an air leak at the fittings, I removed them and found 2 torn O-rings. They were replaced with some extras that I had in my shop. Working fine since.
That was excellent information!
![Icon Clapclap](https://www.jaguarforums.com/forum/images/smilies/icon_clapclap.gif)
(Seem like the same procedures as repairing Air Brake Systems.)
Added: My left front had an air leak at the fittings, I removed them and found 2 torn O-rings. They were replaced with some extras that I had in my shop. Working fine since.
Last edited by reyesl; 01-25-2012 at 07:44 AM.
#19