I had a really long delay on my outside temp sensor, and I saw somewhere to unplug it and plug it back in. I unplugged it and the fans quit on the truck, temp on the dash says 50* and it's been blowing hot air inside the truck. Any ideas of how to fix this? Did I break something? Too hot here for hot air in my truck when it's 90*.

Thanks!

 

The AC does not like it if you don't have an AAT.

From the Workshop Manual:

NOTE: Compressor control and the evaporator temperature are a function of many parameters, not a straight on off to avoid freezing the evaporator. The PCM monitors multiple temperature sensors correlation (AAT, CHT, ECT IAT, MAF...) as applicable. The PCM runs this logic after an engine off and a calibrated soak period, typically 6 to 8 hours. This soak period allows the Ambient Air Temperature (AAT) sensor and the other temperature sensors to stabilize and not differ by greater than a calibrated value, typically 18ºC (32.4ºF). If a sensor input is found to be reporting a temperature imbalance the PCM does not allow the A/C clutch to engage. For more information on PCM sensors, Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Try a reset:

After replacing an Ambient Air Temperature (AAT) sensor, the sensor data must be reset by either driving the vehicle at speeds consistently about 20 MPH for at least 5 minutes to update the filtered data or perform the multiple button press reset procedure to update to the current raw value.

The multiple button reset for the Ambient Air Temperature (AAT) sensor is as follows:

• On the HVAC panel controls, press the A/C and Recirc buttons simultaneously, then, release both.
• Within 2 seconds press the A/C button again.

 

I figured it wouldn't like having the plug disconnected. But if I'm reading this right, and please correct me if I'm not. But after a 6-8 hour period of resting, the sensor will calibrate and things should be ok tomorrow morning?

 

That is what I'm figuring should happen. I edited my first post with the reset procedure. You might try that.

 

Please keep us updated, I have been disappointed in my sensor and really hopes this works for you.
52merc as well put me on the right path, do not try and modify (I was thinking of relocating it).

 

I'll try these and see what happens. Thanks!

 

I am no expert when it comes to relocating the AAT. My 2016 has it in the middle of the front grille and it seems to be accurate. It will give high temperatures for a little while after it sits, but that is due to the heat coming from the radiator. Once moving, within a few minutes, it reads correctly. The AAT is slow reacting by design so that sudden ambient temperature changes (such as driving into a heated parking garage in winter) don't cause sudden system changes.

Many of the newer models with the AAT in the rear view mirror seem to be more inaccurate but I'm not sure why. I assumed it was moved to the mirror to prevent the heat soak problem from the radiator.

 

My truck sometimes has a long delay before showing the correct temperature also but it has never failed to correct itself

 

My 2020 takes a couple of miles to catch up to the current temp.

 

So this morning, it was back to normal. The displayed temp was 64* and was blowing cold air inside, so the sitting for 6-8 hours worked. The temp still didn't update as I was driving though, and I took the "long" way today. I live in a small town and my commute is not even 5 minutes one way, including stopping at a gas station, and the speed limits are 25 in town. But I did try the multi-button trick mentioned above, and it updated in the temp on the display. So at least I know I can update it manually as I drive.

Thanks all, for your help!