On my 1998 Deville its located in the trunk. the panel thats is butted up to the back of the rear seat. look for some black nuts around the top of rim of the trunk, they are about 1'' long, these have to be removed first... good luck.....
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maybe there is a leak in the system and the pump is constantly trying to compensate. if the vehicle sits for a day or so, will the suspension sag in a certain spot? maybe a leveling sensor. may have to be diagnosed with scan tool