Ok, can someone please explain to me the procedure on testing the oil cooler on vehicle with the RADKIT? I tried it and, maybe im overlooking, or not doing something right but, i cant get a vacuum on the cooler with no coolant in the cooler (blew it out with air). I'm not understanding how we are pulling vacuum on the rear oil cooler port with an open cooling system ( egr cooler replacement) Someone has to have gotten it to work?