We don't often get to 118, that's Phoenix. Last July, we did the testing of the flathead cooling on the roadster when it was 110 out, wasn't too bad with the top up. With the cowl vent open and the back window out, there is lots of air flow. I don't think it would be good in Phoenix at that time of year though.....that's why we built the 39 since it has roll up windows.