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Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
You will need a scan tool that is capable of commanding the suspension control module. Here is the procedure.
WARNING: Do not remove an air spring under any circumstances when there is pressure in the air spring. do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring to prevent vehicle damage or personal injury.WARNING: Disconnecting an air line that is connected to the air compressor can cause personal injury or damage to components as high pressure air is vented uncontrolled.WARNING:Do not attempt to install or inflate any rear air spring that has become unfolded to prevent vehicle damage or personal injury. Any rear spring which is unfolded must be refolded prior to being installed in a vehicle. The air spring refolding procedure should only be used for an air spring which has never supported the vehicle's weight while in the improperly folded position. Improperly folded air springs found on vehicles during pre-delivery inspection or after use must be replaced. Do not attempt to inflate any air spring which has been collapsed while uninflated from the rebound hanging position to the jounce stop. When installing a new air spring, care must be taken not to apply a load to the suspension until springs have been inflated using the air spring fill procedure. After inflating an air spring in hanging position, it must be inspected for proper shape.
The vehicle is an OBD2, and the data link connector will look something like this shape. Not sure if the "older" snap on will be able to do it.
Yeah, you have to be carefull with them. Also, without the scan tool there is way of doing it.
Just get a jack with the suspension switch on, raise the rear of the vehicle, wait fifteen minutes, and lower it. Once lowered, turn the air suspension off, or disconnect the compressor. Thanks