I'm assuming that you are asking about this old vintage automobile swamp cooler.
I used one of these on my VW bug for years back in the 70's and it worked great.
Here's how it works.
The unit is mounted on the passenger door by inserting the tab above the vent into the window slot then closing the window on it.
A brace can be added to the outside attached to the tab there with the other end inserted between the window and window frame at the bottom of the window.
Then water is put into the cooler through the round door on the top outside seen in the first picture up to the bottom of the front opening. Ice can be added but is very time consuming to push one cube at a time through that small opening.
Then, as the car is driven air is forced into the opening on the front in through the medium that is contained within a hardware cloth cage attached to a spring that is wound up when the rope is pulled through the inside vent.
New coolers have a screen over the opening to keep bugs from entering. This old one for sale on eBay is missing that.
There are louvers in the vent to direct the air flow.
As the rope is pulled the cage is turned and the spring is wound. Then, the cage slowly turns as the spring is unwound such that the air going through the cooler passes through the wet medium in the top half of the cage. It takes a few minutes for the spring to unwind. Then, when the air doesn't feel cool anymore, the rope is pulled to wind it up again and the process is repeated. The water in the cooler can last for many miles before needing refilled.
The cooler worked great for my VW bug because the air space in the car was small and the car was air tight such that opening the driver vent window a bit created a vacuum that pulled the air into the car through the cooler. We traveled all through the southwest in the heat of the summer nice and cool inside.
As the family grew, we got a larger vehicle - an old Jeep Wagoneer. I installed the cooler hoping for the same great result. Didn't get it for two reasons, the air space in the vehicle was too large and the Wagoneer wasn't air tight enough to just suck the air in through the cooler without sucking hot air in through all the air leaks.
For those two reasons, (and because they are so darn expensive now, $300+ compared to $15 I paid for mine) I have not bought a swamp cooler to put on my 47 fordor sedan.