I have noticed since last fall when I first got my 97 TJ that the heat coming out of the floor vents was substantially less than what I used to get from my YJ or CJ. I hear lots of fan noise, and have hot air, but hardly any volume coming out of the floor vents. Tonight I observed that when the temperature is set to full heat, there is little air output, but the closer I move it to the cool side, the more air output I get. The difference in air volume from the cold side to the hot side is very significant, hardly any airflow on the hot side, and lots of airflow on the cold side. I am wondering if the heater core may be blocked by leaves, etc and if that is what is causing my poor airflow. Does this sound logical? I don't have AC, so removing the heater core would be a pain, but not as bad as if I did have AC. Any other suggestions as to what my cause the poor airflow? Where do all the leaves and tree pods that go down the air intake in front of the windshield end up? Is there anyplace where I could vacuum them out without having to remove the heater core?