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I have a 2013 impala lt and it's not reading an outside temperature at all, just has "- - - F°" I've tried to find it, removed the plastic over the radiator and found some wiring harnesses, on plugged into the left (passanger) side, which has another harness attached to the wiring, but that is not plugged into anything? Could that be the sensor? Or is it the purple harnesses connected in the middle?
 

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I have a 2013 impala lt and it's not reading an outside temperature at all, just has "- - - F°" I've tried to find it, removed the plastic over the radiator and found some wiring harnesses, on plugged into the left (passanger) side, which has another harness attached to the wiring, but that is not plugged into anything? Could that be the sensor? Or is it the purple harnesses connected in the middle?
The sensor is black and small, and has one wiring harness connector (with 2 wires if I remember correctly). It has a plastic push-pin connector on the back side, which pushes into the radiator support on the passenger side.

If you use the ACDelco on-line catalog to search for the sensor (ambient air sensor), it will show a picture - which may help you.

When you replace it, check the wiring harness connector. They are prone to corrosion, and ACDelco also sells a wiring connector pigtail, in case you have to replace the connector also (so you don’t have to replace the entire wiring harness in the front). When I have replaced them on my GM vehicles (Corvette and Impala), I have put a small amount of silicone dielectric grease on the connector, to prevent water intrusion and corrosion. Many auto parts stores sell small packs (like a fast-food ketchup pack) of the grease.

The sensors are very inexpensive and calibrated correctly (plug and use). I would suggest not buying an after market sensor.
 
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