When it's not raining, get a garden hose running at a trickle. Try one upper corner of the windshield. See if it leaks. If not try the other side. See if it leaks. If not then try the middle and see if it leaks. If not then repeat but from the roof right above the windshield. If nothing still then get a small cup of water and try it along the top of the windshield with the top pulled back. Locate where the water goes in to create the leak and then you can decide a course of action.
Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee. - The Yeti
Husband and father of two, ASE Certified auto parts salesman and 4x5 film photographer extraordinaire.