My son has a 2014 Chevrolet Sonic sedan that the air conditioning constantly stops cooling, about once a month it blows air but not cool, he then takes it to a friend that has a Snap-on scanner (but not much knowledge) and he says he clears the codes and the a/c starts cooling again. I will find out which codes it shows when the a/c stops cooling again, but based on this information does anyone know what's happening? Thanks for you help.

 

not without the codes.

 

Hi, the a/c just went down, and these are the codes :
P0128 Engine coolant temprature (ECT) Below Thermostat Temperature (Symptom 00) - Current DTC Test Failed Test not passed since power up
P0171 Fuel Trim system lean (symptom 00) Test Failed
P0597 Engine coolant Thermostat Heater Control Circuit Failed since DTC cleared+

Thanks for your help

 

the thermostat dtc are causing the pcm to enter an overheat protection strategy. it will shut down the ac to reduce heat load on the cooling system.