Manual Reservoir Deflate
All pressurized air suspension components contain high pressure air (up to 220 psig). Use extreme caution when inspecting for leaks. Wear safety goggles and adequate protective clothing when inspecting or servicing the air suspension system. A sudden release of air under this amount of pressure can cause possible serious or fatal injury.
Support the vehicle by supplemental means before performing any work on the air suspension system to prevent the vehicle from changing height. Before any given component is to be serviced it must be deflated. Servicing the air suspension system without supplemental support, or with pressure in the specific component, can cause possible serious or fatal injury.
The air suspension system will not auto-disable when the vehicle is lifted on a frame hoist or when jacking one corner of the vehicle.
- With the ignition in the ON position and the air suspension system was disabled: the system will exhaust the air out of the system down to a minimum retention pressure. The system will reinflate once the vehicle is lowered on the ground and the key is cycled off then on. If the system has enough pressure it may attempt to level as soon as the system detects it is below target height.
- With the ignition in the OFF position, the air suspension system will keep pressure in the air bags and will not deflate or react to being lifted.
The air suspension system can be disabled using the interface on the instrument cluster or radio, depending on vehicle options. Select Tire Jack Mode if the vehicle is lifted on a frame hoist or when jacking one corner of the vehicle.
- Using the radio, select Settings>Suspension>Tire Jack Mode.
Perform this procedure if the entire system was completely purged of air.
The gauge on the Air Suspension Refill Tool - 10247B reads the vehicle pressure. The regulator limits the pressure in the line to 12 bar (175 psi). When connected to the reservoir with the valves open, pressure in the reservoir can be read on the scan tool.
The Air Suspension Refill Tool - 10247B is used with a nitrogen supply tank which can be acquired at a local gas supplier. The nitrogen must be Purity Class 5 (99.999% pure) .
- Place the ignition in the ON position.
- Place the air suspension system in Tire Jack Mode. Place the ignition to the OFF position.NOTE:
The air suspension reservoir is located under the passenger side of the cab, on the frame rail.
- Remove the reservoir fill connection cap (not shown in illustration).NOTE:
Make sure the valve is closed. Turn the valve counterclockwise. Connect the quick coupler to the reservoir fill connection.
- Using the scan tool, deflate the system to atmosphere. This will help the dryer on the system re-charge.
- Raise and support the vehicle so the suspension system is hanging with all four wheels off the ground. Refer to HOISTING, STANDARD PROCEDURE .
- To deflate the system: using the scan tool and the routines under the Air Suspension Control Module (ASCM), deflate the complete system to atmosphere.