I recently had an issue in my 02 lariat where at certain ramps the ac would kick over to defrost only until I let off the gas, then it would go back to the vent. I tried the fix of replacing the o rings in the eatc and put it all back together. Now it won’t blow out of the vents. Only does defrost and floor. And won’t do normal ac only blows cold on max ac. I’m not sure what I screwed up but I really need some help on this.

 

Found the problem after taking apart the eatc for the third time. One of the springs wasn’t set properly. Vents and ac work fine now