not sure what I can be doing wrong though. I put the car up against the garage, leave the property, and then kill myself. I then go back to the garage and nothing. It just doesn't work.
Make sure you go all the way down to the manhole cover. Make sure you also dont have the car pushed into the garage door, rather pressed up against it. Also, make sure you walk back to the garage once you respawn.
Hmm I must not be putting it up against the garage correctly. I guess I'll try that then.