It's been several years but I don't recall any type of weep holes in those lower corners. Also check the edges carefully as they tend to swell and split from rust. There are after market frames available. I don't think the holes would hurt anything as long as the frame is still solid. I installed my glass with urethane glass setting compound. I did not fill the channel I set the glass on spacers on one side then caulked the frame from the other side. Let it cure then flipped over the frame and removed the spacers and repeated the process. Not oem but will seal the water out.