My auto AC/Heater controller when on auto blows cold when temp set at 84 degrees

What is your question?

Have to get the temp control up to 88 degrees before warm air is felt. When on manual no AC on and I start the car AC comes on. Yesterday while I had Temp set @ 78 degrees. After awhile the air was getting cool so I changed it to 80 degrees and it cooled again. Finally went up to 88 degrees then air got warm. AC was not on. Outside air was around 50. On auto it works good for about 30-45 mins then goes goofy. I'm thinking the whole AC/Heater control needs replacing.

What makes this problem better or worse?

It's just random.

How long has your 2004 Kia Optima had this problem?

2 years