Car Dies and idles sporadically

Had problem with car stalling, most of the time if the air conditioner was on it would not stall as long as you did not stop quickly, then the belt was squealing for about two weeks before I finally had it replaced. But air conditioner stopped blowing cold air right before replacing the belt. Once belt was replaced and check engine light reset and checked the air conditioner and he said it was over charged, but I do not think he checked both the high and the low readings and it had ran ice cold just a week before. It ran fine actually great for about fifteen to twenty miles then at a stop light died and check engine light came back on, now during the day it stalls immediately right after starting. I took it to auto parts to put it on the code reader and it has codes P0102 MAF sensor circuit frequency and P0050 HO2S-21 (bank 2 sensor 1) heater circuit malfunction, my question is would either of those things cause the air conditioner to stop working? Also while running and air conditioner on highest setting, the small fan in front of the radiator did not come on maybe this is the air conditioner problem.