My 2006 GX won't hold R134A. After adding dye to the system, the only evidence of a leak is behind the rear passenger tire, near where the rear evaporator is located? I'd like to delete the rear AC but have had a hard time finding caps that are labeled as compatible with the GX470. Has anyone used caps to delete rear ac? Can you share what caps you used, so I can order a pair? Thank you!