There were two "air" suspensions on 90's Imperials. The most common was the
K-car air shock system with the compressor behind the rr wheelwell. All it
did was keep the rear end from sagging under heavy loads.) Every parts store
has replacement shocks for this system at a reasonable price.
The four wheel airbag system is another story...you don't want to hear about
it.
Phil Brust
Jefferson GA