[Stelvio PR]

Hi, I know this has been discussed int he past, but I have not found a solution to the problem, so maybe someone knows the answer or can steer me in the right direction. I have a 2018 Stelvio 2.0L and two days ago the A/C wouldn't cool propertly. I noticed that the ambient temp reading was 45F which is totally inaccurate by about 40 degrees F, when driving it would oscillate between 44F max and a min of 42F. To make the A/C work I went from Auto mode to Manual mode at Lo Temp and increased or decreased manually fan speed and it was cooling fine. Then, approx. an hour ago I was doing some spirited driving at around 100 MPH and temp started to go down to 17F and afterwards it would stay at 17F and climb to 19F, then back to 17F.; so the A/C in Manual mode started to blow heated air. Very uncomfortable when you are in a tropical island and you know that the actual ambien temperature is in the 80's F. Is this a typical Chrysler product electrical/electronics failure with the ambient temp sensor going bad (I understand that FCA in it's inifinite wisdom made the sensor a part of the right rear view mirror, so you have to purchase the whole mirror assembly) or maybe an electrical issue or something else that I might look at? Vehicle has no warranty,so not taking it to the uber expensive local dealer, and I have a Mopar Shop that works Alfa's and another client that owns a shop that specializes in modern exotic vehicles, so covered there. It is just bothering me, Maybe a TSB is available for such failure? I have a 2014 Nissan Rogue with 100K miles that has never had a single failure; except fo the usual tear and wear, and maintenance; would have expected more from Alfa.

 

[shpuncik]

this is P/N for temperature sensor only

 

[sjjamd]

Hi, I know this has been discussed int he past, but I have not found a solution to the problem, so maybe someone knows the answer or can steer me in the right direction. I have a 2018 Stelvio 2.0L and two days ago the A/C wouldn't cool propertly. I noticed that the ambient temp reading was 45F which is totally inaccurate by about 40 degrees F, when driving it would oscillate between 44F max and a min of 42F. To make the A/C work I went from Auto mode to Manual mode at Lo Temp and increased or decreased manually fan speed and it was cooling fine. Then, approx. an hour ago I was doing some spirited driving at around 100 MPH and temp started to go down to 17F and afterwards it would stay at 17F and climb to 19F, then back to 17F.; so the A/C in Manual mode started to blow heated air. Very uncomfortable when you are in a tropical island and you know that the actual ambien temperature is in the 80's F. Is this a typical Chrysler product electrical/electronics failure with the ambient temp sensor going bad (I understand that FCA in it's inifinite wisdom made the sensor a part of the right rear view mirror, so you have to purchase the whole mirror assembly) or maybe an electrical issue or something else that I might look at? Vehicle has no warranty,so not taking it to the uber expensive local dealer, and I have a Mopar Shop that works Alfa's and another client that owns a shop that specializes in modern exotic vehicles, so covered there. It is just bothering me, Maybe a TSB is available for such failure? I have a 2014 Nissan Rogue with 100K miles that has never had a single failure; except fo the usual tear and wear, and maintenance; would have expected more from Alfa.

Hi. Steve from Australia here. I had the same problem for both ambient temperatture reading and air conditionging issue in my 2018 Stelvio Ti about 2 months ago. It lasted about 1-2 weeks and then it reverted to normal. I don't have a solution for you but would love to know why and what the solution is if it happens again. Good luck.

 

[Alfie]

Mine is off by about 5F warmer so I live with it but is there a way to re calibrate them?

 

[ALFAOFFROAD]

I have not tried this procedure on my car. Won't try it.. because of the entier superstition about not touching things that don't have a problem, and I don't have a problem.. but...

On most if not all FCA vehicles there is a procedure to automatically calibrate the sensor without special tools.


1) Turn Ignition switch to ON.

2) Press both the A/C ON and RECIRCULATE buttons at the SAME time and HOLD for at least 5 seconds.

3) The POWER and RECIRCULATION lights will flash.

4) Calibration should take about about 20-seconds but might take 2 minutes.

5) If lights continue to flash AFTER 3 minutes the control unit has detected a failure. You need a scan tool to pull the trouble codes. If there’s a trouble code stored, the lights will CONTINUE to flash until the unit completes a successful calibration OR until the vehicle has driven 8 miles.... Or until it gets to a repair center.

Theoretically trying this shouldn't hurt anything and should correct small errors....regardless...... If you don't feel comfortable trying this, don't. It might not do anything anyways, not sure it works in every FCA car.

 

[Stelvio PR]

Mine is off by about 5F warmer so I live with it but is there a way to re calibrate them?

5F or more warmer I wouldn't mind as temp here is in the 80+F during the winter, but colder is a pain in the a$$ as the A/C will only blow hot air.

I have not tried this procedure on my car. Won't try it.. because of the entier superstition about not touching things that don't have a problem, and I don't have a problem.. but...

On most if not all FCA vehicles there is a procedure to automatically calibrate the sensor without special tools.


1) Turn Ignition switch to ON.

2) Press both the A/C ON and RECIRCULATE buttons at the SAME time and HOLD for at least 5 seconds.

3) The POWER and RECIRCULATION lights will flash.

4) Calibration should take about about 20-seconds but might take 2 minutes.

5) If lights continue to flash AFTER 3 minutes the control unit has detected a failure. You need a scan tool to pull the trouble codes. If there’s a trouble code stored, the lights will CONTINUE to flash until the unit completes a successful calibration OR until the vehicle has driven 8 miles.... Or until it gets to a repair center.

Theoretically trying this shouldn't hurt anything and should correct small errors....regardless...... If you don't feel comfortable trying this, don't. It might not do anything anyways, not sure it works in every FCA car.

Will try, I don't have issues in doing DIY and figuring things out... Thanks for the suggestion.

 

[jwq2]

I have not tried this procedure on my car. Won't try it.. because of the entier superstition about not touching things that don't have a problem, and I don't have a problem.. but...

On most if not all FCA vehicles there is a procedure to automatically calibrate the sensor without special tools.


1) Turn Ignition switch to ON.

2) Press both the A/C ON and RECIRCULATE buttons at the SAME time and HOLD for at least 5 seconds.

3) The POWER and RECIRCULATION lights will flash.

4) Calibration should take about about 20-seconds but might take 2 minutes.

5) If lights continue to flash AFTER 3 minutes the control unit has detected a failure. You need a scan tool to pull the trouble codes. If there’s a trouble code stored, the lights will CONTINUE to flash until the unit completes a successful calibration OR until the vehicle has driven 8 miles.... Or until it gets to a repair center.

Theoretically trying this shouldn't hurt anything and should correct small errors....regardless...... If you don't feel comfortable trying this, don't. It might not do anything anyways, not sure it works in every FCA car.

might also "just" recalibrate the flapper stepper motor end positions (not outside temp sensor)
"usual" problem with the outside temp sensor are bad connections or water ingress

 

[Stelvio PR]

I have not tried this procedure on my car. Won't try it.. because of the entier superstition about not touching things that don't have a problem, and I don't have a problem.. but...

On most if not all FCA vehicles there is a procedure to automatically calibrate the sensor without special tools.


1) Turn Ignition switch to ON.

2) Press both the A/C ON and RECIRCULATE buttons at the SAME time and HOLD for at least 5 seconds.

3) The POWER and RECIRCULATION lights will flash.

4) Calibration should take about about 20-seconds but might take 2 minutes.

5) If lights continue to flash AFTER 3 minutes the control unit has detected a failure. You need a scan tool to pull the trouble codes. If there’s a trouble code stored, the lights will CONTINUE to flash until the unit completes a successful calibration OR until the vehicle has driven 8 miles.... Or until it gets to a repair center.

Theoretically trying this shouldn't hurt anything and should correct small errors....regardless...... If you don't feel comfortable trying this, don't. It might not do anything anyways, not sure it works in every FCA car.

Tried it and it didn't do a thing. Appreciate your help anyways. BTW, most manufacturers use this method for calibration.

 

[ALFAOFFROAD]

Yup. Also generally doesn't fix anything, but easy enough to try. (In my experience it will cause a problem as often as fix IF it does anything. But that goes for more things then you might think)


Depending on the manufactuer it will "recalibrate" different things, IMO for stuff like temperature sensors no recalibration can be accurate without a control temperature to calibrate to. IE a solution the sensor is submerged in that is a specific temperature. But some manufacturers including FCA (I think) say it resets sensors.

 

[Alfie]

Thanks.. I'm gonna live with 5 degrees...

 

[Stelvio PR]

Hi. Steve from Australia here. I had the same problem for both ambient temperatture reading and air conditionging issue in my 2018 Stelvio Ti about 2 months ago. It lasted about 1-2 weeks and then it reverted to normal. I don't have a solution for you but would love to know why and what the solution is if it happens again. Good luck.

Mine started working after about a week, then it went bad for a couple of days, then good for a few days, and the cycle continues.

 

[jwq2]

Mine started working after about a week, then it went bad for a couple of days, then good for a few days, and the cycle continues.

would seem to point to either bad connection, or moisture/bad insulation on outside temp sensor.....
you could try spraying some silicone oil in the mirror at the location of the temp sensor ......

 

[Stelvio PR]

would seem to point to either bad connection, or moisture/bad insulation on outside temp sensor.....
you could try spraying some silicone oil in the mirror at the location of the temp sensor ......

I believe it's a bad connection. Have trouble taking the door wiring harness connector of, I can unhook the safety clip that holds the connector, but can't pull out the connector. Been looking for a tutorial or something on how to, but haven't found anything yet.

 

[ALFAOFFROAD]

Can you try to isolate it as to how it gets loose?

IE: after opening and closing the door, after hard bumps while driving .. etc. That would be easier then taking things apart without knowing that needs to be done.

Kinda like a recalibration ...spraying some silicon on the sensor is REALLY easy. Won't hurt anything if it doesn't work.

 

[Stelvio PR]

Can you try to isolate it as to how it gets loose?

IE: after opening and closing the door, after hard bumps while driving .. etc. That would be easier then taking things apart without knowing that needs to be done.

Kinda like a recalibration ...spraying some silicon on the sensor is REALLY easy. Won't hurt anything if it doesn't work.

Thanks, I will buy some silicone spray and try it, though now I know how to properly disconnect the door wire harness plug. I have SAILKOTE, wonder if it will work. Anyways, will try the silicone spray.

 

[Mattw]

Hi All, So my stelvio sensor also appears to have failed, was reading 60-95C (only will let you have aircon at full blast!) and then occasionally no reading at all (this actually stops you opening the windows!!). I have tried some spray down the back of the mirror and wiggling the door connector - with no success. Alfa tell me I have to replace the whole mirror £500+!!!
I note in the thread the part number 71753245 is given just for a sensor - however from checking says this is for other models? Has anyone successfully bought this sensor and replaced it? Also any idea best place to get one from?
Thanks
Matt

 

[Mattw]

this is P/N for temperature sensor only
View attachment 28837

this is P/N for temperature sensor only
View attachment 28837

Hi - thanks for the info, to 100% confirm this can replace the one in the Stelvio? Any idea on where I can get one for the UK? Thanks for your help. Matt

 

[shpuncik]

Hi - thanks for the info, to 100% confirm this can replace the one in the Stelvio? Any idea on where I can get one for the UK? Thanks for your help. Matt

personally I've not replaced it but those who did didn't encounter any problems.
you buy it at dealer.

 

[jwq2]

there's not much that can go wrong replacing it, it's a basic NTC resistor, used in most Alfa's (and other makes)
If you can't get it from Alfa, there's usually plenty availble on ebay etc

 

[Stelvio PR]

personally I've not replaced it but those who did didn't encounter any problems.
you buy it at dealer.

there's not much that can go wrong replacing it, it's a basic NTC resistor, used in most Alfa's (and other makes)
If you can't get it from Alfa, there's usually plenty availble on ebay etc

Careful, the USA market and UK market can be very different. As in UK in the USA you have to buy the whole assembly which at my cost (I have fleet discount with Mopar) is US$460.00. But, a friend of mine has a repair shop that specializes in exotics (Ferrari, Lambo, etc.) and he was able to get the part for me from a suppier in Italy, including DHL airfreight it was some US$100.00. But, after fiddling around with the freaking wire harness it has been working close to acceptable, as it is 7-10 Deg. F below the real ambient temp., but that works for me as all I want is cold A/C. If it starts to give problems again I will replace it with the one I purchased. And, if it ever happens a third time I'll just rig a resistor so it always reads 90F!