Someone mentioned cooling an old bus in an earlier thread. I couldn't respond because adelphia now lets customers download only so much and then they shut off access to newsgroups (which they did to me over a week ago). So much for their claim that they provide "The internet wide open."
Here's how I (help to, anyway) cool my '67 bus.
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The fan is out of an early 50's Ford.
Does nothing for the front seat occupants, but anyone in the back gets a good blast of air.