.........yea that is what i was thinking as well an the switch in the trunk is still turned on.........
If i get this right, you've still got front air springs but no compressor to keep them pumped up.
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......the rear suspension replaced with a standard coil springs an the tech that done the work said they had disabled the compressor ........
What was this "tech" thinking when he did that? My first thought is to ask the guy exaxactly wtf he did to disable it..
How many (easy) ways are there to "disable" the compressor? My guess is they might have cut a wire or disconnected a connector. You might look at the trunk switch's connector... see if it's been unplugged.
I don't have a '93, or else I might offer some likely possibilities at other points in the circuit...
Good luck.