Ambient was about 90. I have kept a dial thermometer in the vent for the last few years. In the past the vent temp would be right at 40, even if it was 110 outside.

Sight glass is clear and pressures are on the money. The problem is not with any refrigeration component or charge level. The problem is with the climate control.

Since I posted last night I remembered that I now have a service CD. I gave a quick glance at the CD and it appears that the problem may very well be a temp sensor. It looks like there will be some serious troubleshooting here.

Since the blower is running and air is coming out where it should, it appears that there is no flap or vac problem. It looks like a sensor or heater valve.

Now that the work week is starting I probably won't be able to do anything more until the weekend. I will keep you posted.