2012 Sierra 6.0 AC issues

[Summit15101]

Hello I have a 2012 3500 with a 6.0 in it and recently when I click the AC button all it does is flash 3 times then turns off. It is 24 Celsius here so it should turn on. I have checked the fuse and swapped relays around and checked the wiring to the compressor and found nothing wrong. Does any one have any suggestions on what it would be? Or what else to look for ?

 

 

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[Ianf]

more than likely low on refrigerant. It may have a slow leak, but, DO NOT use any sealer as it will definitely plug the orifice tube and lead to more costly repairs. Have someone check the level, at six years old that is more than likely the problem.

 

[Doug_Scott]

It is behaving like it thinks the temperature is below 0.  Take a look behind the grille and see if you have two sensors.  If you so swap them with each other and see what happens.