Where is the ambient temperature sensor located ?

Just kneel down in front of your XJ.
Look between the bumper and the grille.https://www.rockauto.com/en/catalog/jeep,2011,grand+cherokee,3.6l+v6,1446514,heat+&+air+conditioning,ambient+air+temperature+sensor,7000

ambient air temp sensor is same as intake air temp sensor. IAT Sensor on this vehicle is located in the intake air duct between filter and throttle body.

Ambient Air Temperature Sensor (UH9)
At the front of the vehicle, at the lower left side of the front bumper bar
Ambient Air Temperature Sensor (UH9)
Pin
Wire
Circuit
Function
A
0.35 L-GN/BK
735
Ambient Air Temperature Sensor Signal
B
0.35 YE
61
Low Reference

P0072 - Ambient Air Temperature Sensor Circuit Low Input

- Faulty ambient air temperature sensor
- Ambient air temperature sensor harness is open or shorted
- Ambient air temperature sensor circuit poor electrical connection

Well, I would say that it means that SOMEBODY is confused!

Diagnostic Test Code (DTC) P0072 is defined by SAE J2012 as "Ambient Air Temperature Sensor Circuit Low" DTC P0073 is defined as "Ambient Air Temperature Sensor Circuit High"

I do not know how the ambient air temperature sensor circuit could be faulted both HIGH and LOW at the same time.

The only thing I have ever seen cause something like this is when people try to install aftermarket "performance chips" on their vehicles which "lie" to the computer about what the ambient air temperature is.

There are two sensors; Climate Control Sun Sensor located on the dash or rearview mirror, and an Ambient Air Temperature Sensor located by the climate control panel. I believe the one you're looking for will be the Ambient Air Temperature Sensor.

LOOK ON DASHBOARD AREA FOR A LITTLE BUBBLE LOOKING THING PROTUDING UP SOMETIMES NEAR WINDSHEILD

The ambient temperature sensor for the mirror display or outside temerature, is located between the grill and air conditioning condenser. The coolant temperature sensor is located in the left (drivers) side cylinder head.

Go to Matthew's Volvo Site and search under "ambient temp sensor" I posted detailed instructions and pictures of how to fix this. Enjoy

the sensor is located under the front bumper.or the grill