GM 25978169
Compressor Assembly, Rear

Wear appropriate protection during replacement such as gloves along with ear and eye gear before using a clean cloth to wrap air supply lines to avoid pressure-related injuries. Support your vehicle between D-Height and Full Jounce without pressurized air first and disconnect the air suspension system fuse before depressurizing. Start by lifting the vehicle to a proper height and secure it before removing the air spring compressor bolts on the frame mounting. The maintenance process commences with disconnecting electrical connections for the air inflator switch as well as the air supply lines and vent hose from the air spring compressor followed by separating the electrical connector from the air spring compressor. Disconnect the air supply lines from the air spring compressor and remove the compressor from the vehicle when ensuring that air supply lines match the color markings on the air spring compressor. Check the air supply lines for any signs of damage. Replace the components with deep scores or cuts detected. Use existing fittings from the new compressor to attach the undamaged air supply lines then tighten them to 2.25 N.m (20 lb in). Install the air spring compressor electrical connections while proceeding with the air inflator switch electrical connections and then the air supply lines and air spring compressor vent hose connections. Place the air spring compressor onto the frame mounting bolts and fasten them to a torque of 20 N.m (15 lb ft). After reattaching the air suspension system fuse lower the vehicle to begin testing the air spring leveling operation during which you must keep the engine running for one minute. Examine D-height and look for any air leaks before proceeding. Replace the air supply lines once leaks are detected at the air supply line connections at the air spring compressor.

To replace the air spring compressor, put on safety equipment such as gloves, ear as well as eye protection, and cover the air supply flex lines with a clean material to avoid injury due to sudden relief of pressure. Depressurise the air suspension system only after the rear axle has been supported and set from D-Height to Full Jounce. Start by locating the air suspension system fuse and take out the fuse to avoid calibration problems with the air suspension leveling sensor. Lift up the vehicle, a then take out its air spring compressor mounting bolts. Disconnect the compressor electrical connection after removing the air inflator switch electrical connection and air supply lines, the vent hose. In the disassembly, make sure that the color of the air supply lines, matches that of an air spring compressor for reassembling the compressor to the vehicle, disengage the air supply lines from the compressor and take off the compressor from the vehicle. Check for damage in the air supply lines. if not, remove the fittings from the new compressor and lobby their ends into the fittings and tighten to 2.25 N.m (20 lb in). In case of any damage, replace with air supply lines. Reconnect the electrical connection as well as the air inflator switch connection, the air supply line as well as the vent hose to the compressor. Mount the compressor to the frame mounting bolts, then tighten them to 20 N.m (15 lb ft), after that, lower the vehicle and reconnect the air suspension system fuse. Start the vehicle and let it operate for just about 1 minute to verify the air spring leveling system, inspect D-height, and inspect for leaks at the air supply line connectors; if any leaks are found, replace the air supply lines.

Before starting the air spring compressor installation begin by taking out the air suspension system fuse to stop air suspension leveling sensor calibration issues. After raising the vehicle for support you should remove the air spring compressor from its frame bolts. The change procedure starts with air spring compressor ventilator hose separation from the air compressor followed by air supply lines and air inflator switch electrical connection. Finally, disconnect and remove the air compressor electrical connection to the air compressor. Verify that the compressor's air supply lines feature the identical color pattern as its air spring compressor components before taking out the supply lines completely from the air spring compressor to remove it from the vehicle. For undamaged air supply lines clean their fittings off the new compressor then use the original fittings to connect the compressor components tightening each fitting to 2.25 Nm (18.5 inch lbs.). Replace the air supply lines anytime you detect any form of damage. For installation start by connecting the air spring compressor electrical connection followed by the air inflator switch electrical connection then the air supply line and finally the air spring compressor vent hose. Once the air spring compressor is bolted through frame attachments use 25 Nm (18 ft. lbs.) torque and after vehicle lowering reinstall the air suspension system fuse. Start the engine and continue operation for a minute to verify the air spring leveling system works correctly and measure D height and check for leaks. Air supply lines must receive replacement if they show leaks while connected to the air spring compressor.

Start by putting on gloves and safety glasses and ear protection before replacing the Automatic Level Control Air Compressor. Wrap a clean cloth around the air supply lines as a precaution. Support the rear axle between D-Height and Full Jounce before depressurizing the air suspension system while removing the air suspension system fuse to prevent calibration problems. Remove the air suspension system fuse first then lift and stabilize the vehicle. Before proceeding disconnect the air inflator switch electrical connection along with the air supply lines and the air spring compressor vent hose from the air spring compressor and separate both the air spring compressor electrical connection and frame mounting bolt connections. The air supply lines need to receive matching colors to those of the air spring compressor before assembly occurs. The technician will detach air supply lines from the air spring compressor so he can remove the compressor from the vehicle. Visual inspection should reveal any damage on the air supply lines. The new compressor's fittings should be discarded in favor of using the existing fittings to link air supply lines to the air spring compressor by torquing them to 2.25 Nm (20 lb in). The diagnosis reveals heavy damage to the lines thus needing replacement. Start by connecting the air spring compressor electrical connection followed by the air inflator switch electrical connection and air supply line and air spring compressor vent hose. Fasten the air spring compressor to frame mounting bolts at 20 Nm (15 lb ft) torque and then lower the vehicle before reinstalling its air suspension system fuse. After vehicle startup check the air spring leveling system's proper operation by running the vehicle for one minute before inspecting D-height and conducting leak checks. Check the air supply lines connecting to the air spring compressor since any detected leaks require line replacement.

The first step to replace an air spring compressor is removing the air suspension system fuse which stops calibration problems in the air suspension leveling sensor. The rear axle needs support at an angle between d-height and full jounce before completing air suspension system depressurization. First raise and support the vehicle before removing the air spring compressor mounting bolts. First disconnect the air inflator switch electrical connection from the compressor and then disconnect both supply lines and hose before disconnecting the electrical connection along with the supply lines . During reassembly check the air supply line coloring against the air spring compressor color scheme. Use fittings from the new compressor with existing fittings for the air supply lines then connect them to the compressor while tightening each connection to 2.25 nm (20 inch lbs.). The presence of any damage within air supply lines calls for replacement of those lines. Start by connecting the electrical wires for the air spring compressor before installing the air inflator trigger electrical wire and the air line tubing and hose. Connect the air spring compressor to the frame mounting bolts before securing them at 20 nm (15 ft. Lbs.). Bring down the vehicle after reinserting the fuse for the air suspension system then start the engine to run for one minute while monitoring the air spring leveling system. The final inspection checks d height as part of leak assessments. Leaks detected at air supply line connections require replacement of the entire air supply lines.

Remove the air spring compressor mounting bolts, disconnect the air inflator switch electrical connection, air supply lines, and vent hose from the compressor, and disconnect the electrical connection.