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Kind of a screwy problem on my 2013 2500HD. On occasion the dash reading for the outside temperature drops to 22F. I have now noticed that whenever I honk the horn it happens. When the reading drops to a certain level , the AC goes off and the heat comes on. Over the next 5 minutes or so the temperature readout will climb to the correct reading and I can turn the AC back on. Anyone ever heard of this and does anyone know where the sensor even is?
sounds like electrical gremlin…but I’m not a technician, I do however have a particular set of skills that will help…I know where the outside ambient air temp sensor is and it can indeed affect the AC operation…the horn however….I give up. Its on the radiator core support behind your grille. If you follow from your hood latch assembly you will see an a-frame of support bars, the sensor is on the crossbar of the A. basically the only horizontal metal bar running across the front of your radiator. It is mounted off to the passenger side of that you will see a wire harness ending in a plastic block with a circle in the middle (usually).It is about the only thing on that cross member so it should stick out to you.