yar as long as you can get it closed.. my driver side window was gone, motor trimmer fixed it with luve and needle nosed pliers and didnt want anything for it.. you should be able to find the places on the zip that it is not catching.
Make sure it is all clean at those places and that the zipper mechanism is tight and catching in those places.
squeezing the zipper mechanism at the rear is best, or it worked for the motor trimmer anyway
you should be able to avoid a replacement zip..