My 1998 Ford Crown Victoria was running just fine when parked Thursday evening. Friday morning, the air condiioner compressor will not come on. The fan runs--everything else runs fine.

Use vinegar to unfreeze

Could be air lock or radiator plug .

bad iconic swich or bad coil

Air ride suspension basically works like this. you have a small air compressor and a sensor that connects between the rear axle and the under body Frame. When this sensor detects a load movement like more or less weight it turns on the air compressor to air up or opens a exhaust valve to let air out. most common problems with this system. broken or disconnected sensor. leak in the air lines between compressor and shocks. or a bad or weak compressor.

most likely not charging. Put a volt meter accross the batery when car is running. Should read at least 13.5 to 14.5 volts. If lower its not charging . Check for poor connection at battery connections .

have someone or someone's stand on the back of the bumper then turn it back on and see if it will raise it up.

replace the wiper motor, the park position is broken, need to replace complete wiper motor.

Sounds like the problem is in the air bag suspension, not the compressor. The air bags shouldn't be losing air when the car sits. The compressor adjusts the suspension level according to the load. The air bags have a valve similar to a blow up raft that allows air to pass through both ways. If when the car is running the compressor is constantly running and not turning off, the issue is within the air bags and/or the air line.

Fuse 9, 50A under hood, Fuse 5 15A Instrument panel. If they're ok, make sure the compressor clutch can be turned by hand (engine off, obviously). If not replace the compressor. Most common problem is the cycle switch. That should be the electrical connector on top of the accumulator. Just jump that by backprobing the connector on both sides with a pinand connect them, with the car on and a/c on if the compressor clutch engages, replace the switch. If it doesn't, try wiggling wire harness and watch it, if it engages, find a broken wire and repair it.

You probably have a leak in the system. Did "they" check the lines and air suspension? "They" probably disconnected the compressor to keep it from burning out from overuse. You need to fix the leak before reconnecting or the compressor will wear out very quickly.