2000 P38 Air Compressor Problem

Hey guys im new to these forums and this is my second post,

so i baught my p38 from a salvage yard and when i got it the air compressors worked, theyd go up and down rising the vehicle, but since february its been sitting infrront of my house with the battery cable disconected.but now the car doesnt rise when started all i hear is the hissing noise of it trying to

is there any way to fix this???

thank you, shawn