Rear shocks wont deflate on a 1998 Cadillac Deville

Sounds like it was raised and te air suspension was not turned off. There is a air suspension pump under the hood there is avalve on it just like a valve on yur tire let the air out of this valve until shocks completely lowered now start car wait for car to reach normal level if it does not stop the leveling rod on the axle is disconnected reconect it

SYSTEM OPERATION TEST
NOTE:Ensure height sensor arm assembly and link assembly are in good condition before performing system operation test.

Open hood and trunk. Turn ignition off. Place vehicle on flat surface. Measure distance from ground to top of rear wheelwell opening. This distance is unloaded height. Start engine. Cycle ignition off then on to reset system. Add 300 lbs. (136 kg) of weight to trunk. Allow at least 28 seconds for delay. If compressor starts, go to step 4.
If compressor does not start and vehicle is within one inch (25.4 mm) of unloaded height, perform SYSTEM DOES NOT EXHAUST test under SYMPTOM TESTS.
If compressor does not start and vehicle is not within one inch (25.4 mm) of unloaded height, perform HEIGHT SENSOR adjustment under ADJUSTMENTS, and then retest system. If compressor still does not operate after adjusting height sensor, perform COMPRESSOR DOES NOT OPERATE test under SYMPTOM TESTS.
If compressor stops within 7 minutes, go to next step. If compressor runs continuously, check for the following conditions. If none of the following conditions exists, replace height sensor:
Stuck ELC relay.
Short to ground in Yellow wire between ELC relay and height sensor.
Short to voltage in Dark Green wire between ELC relay and compressor connector.
If system leaks down, perform IMPROPER OR CONTINUOUS EXHAUST test under SYMPTOM TESTS. If vehicle returns to within one inch (25.4 mm) of unloaded height, remove load and go to next step. If vehicle does not return to within one inch (25.4 mm) of unloaded height, perform HEIGHT SENSOR adjustment under ADJUSTMENTS, and then retest system. If compressor still does not stop within 7 minutes, perform IMPROPER OR CONTINUOUS EXHAUST test under SYMPTOM TESTS.
If system exhausts within 28 seconds, go to next step. If system does not exhaust within 28 seconds, perform SYSTEM DOES NOT EXHAUST test under SYMPTOM TESTS.
If vehicle returns to within one inch (25.4 mm) of unloaded height after 2 minutes of exhaust, system is operating correctly. If vehicle does not return to within one inch (25.4 mm) of unloaded height after 2 minutes of exhaust, adjust height sensor. See HEIGHT SENSOR under ADJUSTMENTS.