Measure the width of the van between the frame supports located just behind the seats and the height of the van from ceiling to floor. Check the height from the point where the frame support bends inward to the roof of the van -- it should be approximately 4 inches.
Measure the fabric so you have a length that's 10 inches longer than the width of the van and cut. Lay out the cut fabric and measure the height of the van, add 6 inches on the side you have just cut. Cut the fabric to size.
Fold over the material along one edge of the van-width side of the material to a depth of 5 inches and pin in place. Insert another row of pins 4 inches in from the edge, creating a pocket 1 inch wide. Sew along these lines with the sewing machine, or by hand, if you prefer.
Cut a length of weighted curtain tape to fit along the edge opposite the one where you have just sewn. Fold the curtain material over it, pin in place, and sew, being careful to also sew the ends, as this keeps the tape in place.
Feed the expandable shower curtain rod through the 1-inch pocket in the curtain until all the curtain is on the rod. Twist the rod to adjust its length. Fit in between the frame supports behind the driver's seat, pushing it as high as it will go. Pull outward as far as possible for a tight fit, twist the rod to tighten it, and the curtain will hang in place.
Cut a strip of fabric 8 inches long by 1 inch wide. Cut four pieces of hook-and-loop closure tape, each 1 inch by 1/2 inch. Lay out the piece of fabric you have just cut. Glue one piece of hook-and-loop tape at the left side of the fabric. Turn the fabric over. Glue a second piece of hook-and-loop midway along the fabric and a third a the right side of the fabric. Leave to dry.
Glue the final piece of hook-and-loop to the metal frame support on the passenger side of the vehicle, about halfway up. Leave to dry. Pull the privacy curtain to the passenger side of the vehicle. Wrap the strip of fabric around it so the closure strips lock together to hold it firmly. Press the closure tape on the back of the fabric against that on the frame to keep the curtain in place.
