Manual Reservoir Deflate

MANUAL RESERVOIR DEFLATE

WARNING:
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.

WARNING:
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.

NOTE:
The air suspension system will auto-disable when lifted on a frame hoist, or when jacking one corner of the vehicle. The air suspension may attempt to change height slightly prior to switching to auto-disable. A manual disable is also available by pressing the "Up" and "Down" switches of the terrain select switch simultaneously for more that 5 seconds. The air suspension system will return to normal operation when the vehicle speed reaches 25 kph (15 mph).

This procedure should only be necessary when the entire system was purged of air, as in a compressor or valve block assembly replacement.

NOTE:
The gauge on the Air Suspension Refill Tool - 10247 reads the tank 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 - 10247 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).

1. Place the ignition in the ON position.

2. Place the air suspension system in Park Mode, and return the ignition to OFF.

NOTE:
With the air suspension reservoir underneath the pickup box, the fill fitting will be on the RH side of the vehicle.

3. Remove the RR wheel inner liner to expose the reservoir.

4. Remove the reservoir fill connection cap (not shown).

5.

NOTE:
Before connecting the quick coupler to the reservoir fill connection, make sure the valve is closed by turning the valve counter clockwise.

With Air Suspension Refill Tool - 10247, remove the air hose from the quick coupler and connect the quick coupler to the air suspension reservoir fill connection and slowly open the valve by turning clockwise to exhaust the pressure from the reservoir.

6. Raise and support the vehicle so the suspension system is hanging (four wheels off the ground) Service and Repair.

7. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), deflate the complete system to atmosphere.