Another pretty big clue will be if your roof is completely rusted over.
I have a leak in my car roof.
The drain tube holes are usually located underneath the sunroof itself.
They re equipped with drainage tubes that carry excess water from the roof down and then off your vehicle.
Check to see whether the liquid collecting in the car is antifreeze or water don t taste it.
Once you have determined that the leak is caused by a roof related issue measure the location of the leak in the living space from two fixed points.
If you spot any rust near the roof sand it clean it with rubbing alcohol and maybe even use some touch up paint on top.
If you open it all the way you should be able to see them.
In fact the roof is built to leak albeit in a controlled fashion.
These fixed points can be perpendicular exterior walls a fireplace chimney or other components that extend through the finished ceiling to the attic space or roof surface.