Vehicle Scripting problem

When i spawn my vehicle, you can see the model of it however once you use it the model dissapears. How do i stop this?

More details please.

I’m attempting to change the model a vehicle and when I spawn it it seems fine (all i did to change it was change the lua model) but once i go into the vehicle, i,e. use it, the model vanishes and i am just sitting in on a chair, the chair still moves and everything but there is no model.

Some code would be a nice start.

script, lua or both?

The script is lua -.-

Can be a vehicle script too:eng101: