Heater air conditioner

Sounds like a vacume switch has gone out,
something a code scanner will not read out
all though you have electronic controls on your dash
every car is the same under the dash for ac and heat
there will never be anything more reliable than the old vacume switches. It's going to take some time and probably some muscles spazams unless your into Yoga you will probly have to remove a couple of panels to easily access what your looking for if you dont know what to look for go to autoparts store and ask to look at a vacume switch for controling the bypass doors. Look for these under the dash. Start the car start the ac and switch between the floor, dash and windshield vents you see the vacume switches controling these bypass doors there are two on the driver side but the one you need is on the Passenger side bout foot from passenger door you may have to pull out glove box to access easier
Let me know something will go into more detail if needed.

Thanks Chevytruckin365!
After I made the post the next day this problem reversed and the system is working fine now?
I did troubleshoot the system however by pressing the "Floor" and "Off" buttons at the same time and then release and immediately press " Automatic" button and then I got the trouble code read-out which was "025-115-125" which mostly point to trouble with the blend door or blend door actuator.

If this problem occurs again, I will check both the blend door and the vacumn switch.
Thanks so much for your time and your opinion on my problem.
Hope you have a great day!

Dan :-) Think I'll leave it set at about 78 degrees till the winter comes to an end ( lol )