88 G10 van - How to adjust driver door ???
 

My dad has a 88 G10 - Chevy half ton van. We are trying to adjust the driver door cause the top of the door really needs to go in so the weatherstrip will seal it. As of right now the bottom of the door looks good, & the gap running between the door & fender look good as well. The top hinge appears to be fixed & I see noway to even get to it. Can you adjust the top hinge on this van ? If so how do you get to it to adjust it ? I need some help here.