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A/C failure due to defective Ambient Temperature Sensor? on 2000 Buick Century

Our Buick's A/C works intermittently. I had the system recharged to no avail. Then I noticed when it was failing, the ambient temp reading showed 22F. That would account for no cold air being produced. I found the sensor located in front of the radiator. Question: Is the false reading more likely due to the sensor or the computer? Anyone out there had this experience?

Asked by for the 2000 Buick Century
The system should maintain the temp. you select no matter what ambient temp is! If you want to test the system /sensors it will need to be scanned for trouble codes.
I assume it has digital/auto. climate control that is set to °F scale? Reason being that 22°C would be about right for ambient temp. (july) at your local, on average!-- I think. Either way, the scanner will tell the story.
It may be too soon to celebrate but I replaced the Ambient Temp Sensor a while ago. The Ext Temp immediately showed the actual 70F and the systems is working. If it holds, it will be the cheapest ($14) and fastest fix (15 min) I've ever performed. If it doesn't hold, I reckon we take my Dodge Intrepid on vacation and listen to my wife complain the whole distance.
LOL, hope it does ok, have a nice trip!