1999 Dodge Caravan Left (driver) side no front wheel drive

How did you determine this? Are you having a problem? Are there any unusual noises? Not much information so I'll have to guess.

If you have the vehicle jacked up so both front tires are off the ground, it's normal for only one wheel to spin. Hit the brakes, then block the spinning wheel, release the brakes and the other wheel will spin. That's normal and proper.

There was a common problem in older vans where the large pin in the differential would walk out and catch on the back of the transmission case and break it. You'd have transmission fluid all over and the van would not move.

A broken cv joint will prevent the van from moving but there would be all kinds of racket. This isn't common. Based on the lack of other symptoms, I would guess you just have the tires off the ground. If there's other important information, holler back.

Caradiodoc

You still didn't answer any questions. It sounds to me like it's working fine. You need to block the spinning wheel before the other one will turn. The rattling noise is because there's no weight on the spinning wheel bearing.

Noise is normal because there's no weight on it. What kind of a problem are you looking for? Every single thing you've said so far sounds completely normal.

This almost sounds like a worn outer cv joint. The only other thing that can make that kind of noise would be the wheel bearing, but they usually make a buzzing noise. If they're real bad, you can easily wobble the tire and wheel when it's jacked up.

Before you waste any more time hunting for the problem, consider having an inspection done at a Sears Auto Center or similar place. They used to offer a free inspection as a way to get people to come in. Don't know if they still do that or not, but it's worth asking.

By the time cv joints make that much noise, the rubber boots are usually ripped too and grease is sprayed all over.

Caradiodoc