I can be driving down the road and notice my ac stops blowing cold air. At the same time my turn signals still will work, but the associated clicking noise will stop. If I pull over and turn the vehicle off and then restart it, the ac and blinker noise will go back to working. What is in common here?

This is on my escalade EXT 2008

excessive torque pull when going into third

I get the both the codes p0171 and p0174 on my 2008 escalade, but they only stay on for a day or two then come of and reappear in about a day. My truck only has 77k mi. I have had the code p0449 but I have replaced my solenoid purge valve and that light has turned off.