I've been having A/C issues with my car ever since I bought it 3 months ago...it's been sporadic at best! It would sometimes worked in highways speeds but not in normal traffic and vice versa. Had the AC system checked, checked relays and fuses, everything seemed ok. My CEL came on a few days after I got the car (go figure) and it gave me the code DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage. I've been putting this off trying to fix my AC problem. I had cleared the code and it finally came back on last week....so I figured I should go ahead and troubleshoot it. Final results came back as a bad sensor....so Friday I replaced it and voila..my AC was working and hasn't stopped working all weekend!


SO what I'm thinking happened was:.....The sensor was reading that the ambient temperature was -38 degrees. It was relaying this info to the PCM. What I didn't realize is that if the ambient temperature is 40 degrees or below, the PCM will NOT allow the AC to turn on....and since it was getting this false intermittent reading from the IAT, I'm assuming it wasn't allowing the compressor to turn on.

 

I have never heard of the IAT controlling the AC. .However.. Its good to know that it resolved your AC problem!

Thanks for sharing this info and I hope it would possibly help others to know this as well in the future should they too have some AC issues!

 

I didn't say that the IAT controlled the AC...at all. All I'm saying is if the sensor is giving a false reading to the PCM about the intake temperature (-38 degrees) maybe the PCM is using that info to control whether the AC will come on?? I'm not sure....could it be a coincidence that the AC just so happened to work when I changed that particular sensor?? Maybe?? Just something to ponder!