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Mostly there is no such thing. A few vehicles are equipped with air suspension which is a different thing. I believe you could be referring to pressurised gas shock absorbers.
These are a conventional oil shock absorber with pressurised gas held in the natural air space inside. This helps the unit have a consistent performance especially when working really hard and a standard shock absorber will lose performance due to some foaming of the oil.
On 4-door sedan, remove the package tray and vent duct.
On hatchback, remove the speaker grilles.
Disconnect the brake line from the wheel cylinder.
CAUTION Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes and wash your hands thoroughly after handling brake fluid. If you do get brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY seek medical assistance.
Remove the brake line from the brake hose.
Disconnect the brake hose from its bracket on the shock absorber.
Loosen, but do not remove, the nut holding the suspension support to the shock absorber.
Unbolt the shock absorber from the rear arm.
Unbolt and extract the shock absorber from the body.
Attach the shock absorber to the body and tighten the 3 nuts to 17 ft. lbs. (25 Nm).
Engage the shock absorber bracket with the carrier and install the hardware. Tighten the nuts to 119 ft. lbs. (162 Nm).
Tighten the center suspension support nut to 36 ft. lbs. (49 Nm). There is a bearing located under the suspension support dust cover. Remove the dust cover and pack the bearing with multi-purpose grease. Once packed, reinstall the dust cover.
The remainder of installation is the reverse of removal. Tighten each component to specifications.
On the 4-door sedan, remove the package tray and vent duct. On 1992-96 models, it will be necessary to remove the rear seat back.
On the hatchback, remove the speaker grilles.
On the wagon models remove the tonnue cover and rear seat back.
Loosen the rear wheel lug nuts, raise the rear of the vehicle and support it safely. Block the front wheels.
Remove the rear wheels.
Disconnect the brake hose and the ABS speed sensor from the shock absorber.
If equipped with ABS, disconnect the Load Sensing Proportioning Valve (LSPV) spring from the lower arm.
Disconnect the stabilizer bar link from the shock absorber.
Support the rear axle and loosen the 2 bolts from the lower end of the shock absorber.
From inside the vehicle, unbolt the upper support.
Fig. 1: A rubber cap covers the rear shock absorber tower nut
Fig. 2: The upper shock absorber tower is retained by the center nut (circled) and three surrounding nuts
Lower the rear axle carrier and remove the two bolts.
Remove the shock absorber from the vehicle.
Install the shock absorber assembly onto the vehicle.
Connect the brake hose and the ABS speed sensor to the shock absorber.
Connect the stabilizer bar link to the shock absorber.
Install the wheel and tire assembly.
During installation, please observe the following tighten specifications:
Tighten the shock absorber-to-body bolts to 29 ft. lbs. (39 Nm).
Tighten the shock absorber-to-axle carrier nuts to 166 ft. lbs. (226 Nm) on 1988-91 vehicles and 188 ft. lbs. (255 Nm) on 1992-96 vehicles.
Tighten the suspension support-to-shock absorber nut to 36 ft. lbs. (49 Nm) on 1988-91 vehicles. On 1992-96 models, tighten the stabilizer bar link to shock absorber retainers to 47 ft. lbs. (64 Nm).
Install the rear seat back, vent duct and the package tray as required.
REMOVAL & INSTALLATION
Fig. 1: After you open the trunk lid, use a suitable prytool to remove the trim cover
Fig. 2: Some vehicles have a cover which must be removed to access the shock retaining nuts
Fig. 3: Unfasten the upper shock attaching nuts
Disconnect the negative battery cable.
Open the trunk lid and remove the trim cover. If equipped, remove the nut cover.
Remove the upper shock attaching nut(s). If removing both shocks, remove one at a time.
Raise and safely support the vehicle.
Unfasten the lower shock absorber mounting bolts. One wrench will have to be placed on the bolt head side to retain the bolt as you loosen the nut. Usually a 15mm wrench is used to remove them.
Fig. 4: After the vehicle is raised and safely supported, use a socket to unfasten the lower retaining bolt
Fig. 5: Remove the retaining bolt, then . . .
Fig. 6: . . . remove the shock absorber assembly from the vehicle
Connect the shock absorbers at the lower attachment and install the attaching bolt.
Lower the vehicle enough to guide the shock absorber upper stud through the body opening, then fasten the upper shock absorber attaching nut loosely. Tighten the lower shock absorber mounting bolt to 35 ft. lbs. (47 Nm).
Remove the axle support, then carefully lower the vehicle. Tighten the shock absorber upper nut to 21 ft. lbs. (29 Nm).
If equipped, install the retaining nut cover, then install the rear trim cover. Close the trunk lid.
Answer REMOVAL - SHOCK ASSEMBLY NOTE: Access for the nuts attaching the rear shock assembly upper mount to the vehicle is through the inside of the trunk.
Roll back carpeting on top of the rear shock tower to access shock mounting nuts. Remove plastic cover from the top of the shock assembly. Remove 2 nuts attaching the shock assembly upper mount/spring seat to the shock tower. Raise vehicle on jackstands or centered on a frame contact type hoist. (Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE) Remove the rear wheel and tire assembly from the vehicle. Remove two fasteners holding the splash shield to the shock assembly upper mount. Remove bolt attaching shock absorber to rear knuckle (Shock Absorber Attachment To Knuckle). Remove the shock absorber from the rear knuckle first when removing the shock absorber from vehicle by pushing down on the rear suspension. Move shock assembly downward and tilt top of shock outward, then remove shock assembly from vehicle through top of wheel opening
with great difficulty,three bolts hold the plate that takes the top bush/mounting .jack vehicle up and support with axle stand .Another jack under rear axle ,jack this one up till cars starts to lift then fit the spring clamps and compress the spring.Next undo the 3/4 13mm headed bolts that hold the plate to the chassis ,if you can release them???---??? ,then next using a small bottle jack take the strain on the bottom of the shock absorber and then remove the bolt ,lower the jack and the top one will lower as well ,undo the two nuts on the top mounting and pull the old shock absorber out .Or what i do if back is dancing and thats to do as above to support vehicle ,support lower of shock absorber ,remove the bolt and then jack it up ,then drill a small hole about an inch from the top of the tube and then thread it ,refill the shock absorber with a heavier oil like dextron .fit a bolt into the hole with a rubber washer and its as good as new
This is a dangerous job if you do not have the proper equipment for compressing the spring that is around the rear shock. I do not recomend performing this job without the proper equipment. Unloading the spring without it compressed can cuase injury.
If you have the proper equipment this is how you do it.
REMOVAL - SHOCK ASSEMBLY
NOTE:Access for the nuts attaching the rear shock assembly upper mount to the vehicle is through the inside of the trunk.
Roll back carpeting on top of the rear shock tower to access shock mounting nuts.
Remove plastic cover from the top of the shock assembly.
Remove 2 nuts attaching the shock assembly upper mount/spring seat to the shock tower.
Raise vehicle on jackstands or centered on a frame contact type hoist.
Remove the rear wheel and tire assembly from the vehicle.
Remove two fasteners holding the splash shield to the shock assembly upper mount.
Remove bolt attaching shock absorber to rear knuckle
Remove the shock absorber from the rear knuckle first when removing the shock absorber from vehicle by pushing down on the rear suspension.
Move shock assembly downward and tilt top of shock outward, then remove shock assembly from vehicle through top of wheel opening.