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You may have a bad outside temp sensor, or the sensor braket broke and sensor is to close to condensor or radiator, the most common is the sensor goes bad,
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The air conditioner may not work properly if your ambient temp is reading -40. The a/c control unit monitors ambient temp so that it does not operate at too low outside temps. I would recommend fixing the ambient temp sensor and rechecking your a/c operation.
-40 is a default # that means the temp sensor in front of the vehicle is broken out ushally or going over a curb and people pull them out and brake them then the plastic cover rubs on the wheel when driving. check the splash shields for damage i.e. plastic wheel well covers just infront of both front wheels if loose or missing the temp sensor is attached to them if missing probably will need to also do a wire repair for the conection to the sensor
You can replace the outside temp sensor ( on the center radiator support ). I have seen this correct some that are way off. What are you using for a comparison & How far off is it ? Post back with a comment to this problem. Thanks
WELL I KNOW ONE THING WHEN THE GAUGE IS READING HALF WAY THATS WHEN THEY TURN ON IF THEY ARE NOT TURNING ON WELL YOU HAVE A BAD TEMPETURE CENSOR THIS ONE READ THE TEMPETURE AND CONTROL THE FANS TOO
in the grill area is a sensor it is very comon for the sensor to go bad ,check it to make sure it is clean of debrie (bugs) un plug the sensor see if the temp changes if it does thats most likly your problem, you can test the sensor with a ohm meter by warming it up while reading the resistance
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