On our Splendid, in the rear passenger corner, there is a small wooden inspection cover than can be removed from under the front of the washer. It's about 7" square. After removing it you should see three hoses. Make sure your have antifreeze in all three of them. They should be a hot, cold and drain line. You'll need to pump the antifreeze into the washer to get it through the hot and cold line. Then poor a little more into the washer itself and run it until you know the drain line is full of antifreeze.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.