[AZKen]

Tough to cool a big long metal heat box. On my 66 Carryall, I used to have a clear plastic "shower curtain" behind front seat. We Have 180 deg inside a cab if parked in the sun. But in Minnesota it's a humid heat. We have dry heat in AZ. A/C can't cool you "no matter what". The only thing an AC unit can do is have a good, low outlet temperature. (or a good delta).The rest is inside Cu ft, outside temp, humidity, color of truck...........