Weak compressor, my dads x-pert a/c buddies checked it out and one of them just had the same problem with his 86 Chevy. I no longer tow with this truck so I pulled the trans cooler and it seems to be helping. Maybe it will hold out until December, then it will be cool enough to roll the window down.

Thanks for the follow-up.

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Leo Paugh
Maryland Chevelle Club #017
A.C.E.S.#3731
progress has little to do with speed, but lots to do with direction.
Maryland Chevelle Club (http://www.chevelles.net/mcc/mcc.htm)