That was pretty helpful. Looking at the shroud (grill?) there was quite a bit of grass blocking the holes. Nearly all of them. I took it off and dug it all out with a brush inside and out. I poked around the fins best I could to see if there might be a nest up in there. But it seems to not be. The exhaust in the front blows out strong. So I am guessing so far the grill was just getting blocked. I bame myself for not taking the time to check such things. Let's hope this is the problem! The rain came in suddenly so I didn't get a chance to find out. Maybe tomorrow.