not 100% sure if it is the same for an 85, but I think it's pretty much the same as with my 67
You need to take off the cowl panel...the panel that the wipers sit on. If you open the hood, you'll likely see I believe four small bolts at the front end of the panel, on the side of the engine compartment. You need to take them out. Then you also need to take the wipers off, and the nuts attaching the wiper assemblies to the panel. Then you can take the panel off, and have access to the wiper motor