I am hoping to get some help on the routing of the washer lines on an 86 Silverado. A different shop took the cowl cover off, pulled the lines out, and left them in the engine bay. I can't find any obvious place these lines attach under the cowl nor where the hoses to the sprayers on the wipers themselves would run.

I understand the 2 lines go under the cowl plate in the 2 notches at the top of the firewall but I have been unable to find any photos or descriptions of what happens under the cowl plate.

Any help would be greatly appreciated!