Went to a small car show not to far from home and decided to put the window swamp cooler in before leaving the house. I don't do this usually because I don't want to break the glass and it's for display only. On the way over I noticed it was blowing air into the car on a rather large volume. I didn't have water/ice in the unit so the air was just so-so, like running with the window open. In the afternoon it started raining and I decided to head for home. Again, I left the unit in the widow but took a longer route home. Would you believe the rain cooled air was very refreshing. These things do work! Not sure what would happen at 60-70 MPH and not willing to find out. Got to thinking about the fresh air ducts on the 49-54 Chevys. Put a swamp element in line and I bet it would cool just fine.