[Eraser0428]

I had mine reading 10 degrees cooler than it was outside sometimes it wouldn't display a number and only display ---, this caused the service engine light to come on. I took it to the dealership and they did 11 updates to see if that would fix the problem some of them were communication updates. This didn't fix the problem they ended up replacing the right side outside mirror, evidently the sensor isn't replaceable like the one's that have them mounted behind the front grill. Hope this helps.

 

[Eraser0428]

oh wow, didnt expect that, it doesnt show too warm anymore after sitting still?

Sitting during the day in direct sunlight it dows show high temps but I have had that in my last 2 vehicles, 05 toyota Prius, and a 05 dodge truck. It levels out after moving and getting some air circulating around it.

 

[linuxos77]

Came across this thread.... I recently got side swiped and whole passenger mirror got ripped form the car (ouch). My temp in the dash now shows dashes and the check engine light is on. Wonder if the CEL is because the sensor is now gone? Also, since this the AC will not work, hitting the button does nothing (aside from illuminate the little light on the button itself). No compressor kicks on and RPMs dont change, nothing. Wondering if the missing OAT sensor would cause the AC to disable? Don't think it would but someone aluded to a lot of issues when their sensor failed.

 

[JeepCares]

Just wondering if it's just mine. The outside temp is off by at least 10deg up to 30deg. It's annoying. I am leaving it at the dealership this week so that they can look at it.


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[Earich]

That's good to know because they ordered me a new one and I'm waiting for it to come in. Was afraid it would just do same thing. They did check other Renegades on the lot and they were not reading as high as mine. My temp, when sitting in the sun, is about 20 degrees higher. That is crazy. It takes me 15 minutes to get home from work and it doesn't get down to the normal temp by the time I get home. I think it is useless the way it is.

 

[Copa Pilot]

Remember that "official" temperature reports are taken from calibrated thermometers located in shaded, vented, boxes 10 feet off the ground and specifically located well away from ambient heat sources (asphalt, buildings, etc.) That is often VERY different than actual temperatures at ground level in a specific location such as over asphalt. Also, the thermometers in cars are not calibrated against NIST reference standards. Lastly, temperature, being a very localized measurement of the average heat in the parcel of air immediately surrounding the sensor tip, can vary widely over as little as a few dozen feet laterally or vertically, even if there is no air movement.

For instance:
1) At my airport, the automated weather station, the control tower based sensors, and the NIST-calibrated thermometer in my airplane often differ by 5-15 degrees F
2) My home is located on a ridge 1000 feet above the elevation of my airport. Air temperature normally lapses at 2 degrees C per 1000 feet vertically, so it is always "cooler" in my driveway than it is 1 mile laterally and 1000 feet lower at the airport, all other conditions being equal.

So, assume the external temperature readout in your car is advisory, not tactical, information.

 

[Panzerkampfwagen]

I look at mine and silently laugh when I get in ready to go home from work after it has sit in the sun. Reads sometimes 98 degrees F when it's actually 78 F or lower true temp outside. Not reliable nor a concern. Just a wasted inaccurate display reading not worth depending on 24/7.

 

[Lackadazikal]

Remember that "official" temperature reports are taken from calibrated thermometers located in shaded, vented, boxes 10 feet off the ground and specifically located well away from ambient heat sources (asphalt, buildings, etc.) That is often VERY different than actual temperatures at ground level in a specific location such as over asphalt.

So, assume the external temperature readout in your car is advisory, not tactical, information.

Not reliable nor a concern. Just a wasted inaccurate display reading not worth depending on 24/7.

Couldn't agree more!

 

[Panzerkampfwagen]

Thanks! It is what it is.

 

[tlbattle85]

Now I know what that thing on my passenger side mirror is, thank you!

 

[runnergeek]

Mine seems to be 10-15 degrees warmer than my wife's Fiat 500 with the same design.

 

[Nev]

Mines been giving weird reading the last few days with highs ranging from 18 to 22°C
in the middle of winter!







Turns out, it's the weather.

 

[rsanges]

Mines been giving weird reading the last few days with highs ranging from 18 to 22°C
in the middle of winter!







Turns out, it's the weather.

Funny. Change those numbers to °F and that's been the highs on mine too! Stupid sensor.

 

[dgr401]

Mine just read 5° a few minutes ago, it sees to be accurate at night. That is the same temp that is on our outdoor house thermometer. The sad part is there is a 25 mph wind and the feel like temp is -22°. Good night for a ride to the south. This morning the actual outdoor temp was 10° but the Renegade was in the direct sunlight and the temp gauge said it was 37°, not very accurate.

 

[bonesky]

My temp sensor in the mirror is not working at all now. I have found out that the A/C and 4WD will not work without this one sensor working. I never had this issue on any other vehicle and I think it is crazy that this one sensor has control over the systems it does. From one product engineer to one that designed this one, this is a SH!T design.

Any one got a part number for this sensor so it doesn't affect the trade in value? I need to replace it.

 

[Mud Pie]

I'm in the Energy Management Systems field and as such we use NIST certified temperature meters and air probes for temperature sensor calibrations. The meter and probe are sent away once a year for calibration checks and re-certification. The handheld unit I use for spot checks is considered somewhat cheap; 400 bucks for the meter, 100 bucks for the probe. That ain't cheap to me...

All that being said, I never gave it a second thought to check the accuracy of the OAT sensor on my Jeep. Why ? It doesn't matter to me. If I'm hot, I turn on the A/C. If I'm cold, I turn on the heat. That number display on the dash is just a "gee-whiz" number to me. It's not like I'll sit in my Jeep and say, "Man, I'm hot. Oh wait, the OAT says it's 67*, I guess I can't be hot.".

But since reading this post and learning that the OAT sensor is integral to the operation of the HVAC system in the vehicle (and I don't know WHY that is, that's incredibly stupid programming. I'd get fired or at least strongly lectured for writing a program like that), as long as it still reads and my HVAC responds, it's all good.

 

[Nev]

Check the door loom connector.

The AC uses the temp reading to protect the compressor from low temp (<3°C ?) operation.

 

[bonesky]

My temp sensor in the mirror has stopped working. The temp on the dash now read --F, basically nothing. I have lost function of the A/C unit (no longer blows cold air on any setting) and have lost function of my 4WD function. I also found out today, that to replace the sensor, the entire mirror needs to be replaced. $336.81 for just the mirror at the dealer. When I asked about warranty, I got a blank look as I told them the issue and they said that they can't find the warranty for my vehicle. Perfect. I bought the Jeep used 2 years ago and the 10 year/100K warranty was transferred over to me from the previous owner.
@JeepCACares @JeepCares

Can you help with this?

This issue can be added to the DFMEA of possible issues. Customer is out offroading in the summer and the temp sensor dies. Customer losses primary function of 4X4 drive, has no A/C, and can't get home. Customer losses primary function of 4x4 drive while driving in snow while picking up kids at school. These are a little extreme, but could you imagine. A good designer has too.

 

[Nev]

They are lying to you.

You just need to replace the "sensor" which is a simple thermistor. $10 at the most.

Google the Fiat or Alfa forums on how to replace it. (If it's not just a door loom issue.)


4x4 is not related. Check internal fuse box connectors are correctly seated.

 

[Nev]

But as I said, first disconnect, check and clean the door loom connector with contact cleaner.