after having a bad ambient temp sensor replaced my ac that had stopped working came back up for only a day only to stop working again . i checked the freon fuse and relay all check out ok . dont know what else to check .

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Ambient air temp must be above 45*F for the AC to operate in auto.

Have you tried manual operation, if the sensor fails the controller will default to a set temp (in manual) and should still function. The default temp can be seen on a tech 2, I don't remember off the top of my head exactly what page on the tech2 it is. All temps should be accessible under the AC diagnostics, it will be obvious if the Ambient temp reading is actual or at default.. if "Ice Possible" is displayed on the DIC you have issues with either the sensor, wiring or another component is interfering with the signal.

Hope this helps

Neal

 

Taking legerwn suggestion, this is where to find on the Tech2


Also attached is the GM info in case you don't have it.

 

Thanks for posting oceanbrave

 

@legerwnhis what we do right 👍

 

Time to open up a can of whoop-***!

 

thanks alot for posting the tech 2 video i will try this when i get a chance .

 

i had tryed manual op with no good results at all i too think at this point its a wiring issue . ill have to check later on .

 

hmer the contact cleaner may well help.

If you see a sensible outside temperature on the Tech2 and your A/C is still not working, then it has to be something else.