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  #21  
Old 02-07-2013, 11:11 AM
61Dodge 61Dodge is offline
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Okay when I took my truck in it was only 3* off. That was in the acceptable range. They turned it in to Chrysler, said we will go from there. They were real nice and I think they will try. I had told them that it is normally 8 to 10* off and they made a note of that we will see.
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  #22  
Old 02-07-2013, 12:19 PM
WhiteRamSport13 WhiteRamSport13 is offline
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My truck is off by at least 5 as well. Plain an simple it should be within 2 degrees. That's acceptable. I'm an HVAC tech and that's what I would call acceptable lol
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  #23  
Old 02-12-2013, 03:52 PM
Rocky Harbour Rocky Harbour is offline
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Quote:
Originally Posted by RamTech View Post
I can't say for sure about Chryslers logic, but the main purpose for this sensor is so the PCM has an idea of the ambient temp. IMO, an eight degree variance isn't a big deal when you're talking about engine related functions. I think they just display the info in the EVIC as a convenience without much regard to actual accuracy.
I know as a driver living in a cold climate, I do depend on the accuracy of the temperature gauge. Especially in the spring and fall of the year when weather and road conditions can change very quickly. It can make the difference between thinking you are driving on wet pavement as opposed to ice covered.

A 6-8 degree is completely unacceptable, it is a pure safety issue.
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  #24  
Old 02-12-2013, 04:20 PM
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Quote:
Originally Posted by Rocky Harbour View Post
I know as a driver living in a cold climate, I do depend on the accuracy of the temperature gauge. Especially in the spring and fall of the year when weather and road conditions can change very quickly. It can make the difference between thinking you are driving on wet pavement as opposed to ice covered.

A 6-8 degree is completely unacceptable, it is a pure safety issue.
If I were that concerned about outside air temp, I would install a thermometer from an aircraft.
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  #25  
Old 02-12-2013, 05:25 PM
crabjoe crabjoe is offline
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Quote:
Originally Posted by RamTech View Post
If I were that concerned about outside air temp, I would install a thermometer from an aircraft.
Please don't take this the wrong way, but in this day and age, the temp sensor should be dead-on, except for during some circumstances.

I remember back in '88 or '89, we were in my friend Cavalier Z24 that had outside temp display. I always wondered how accurate it was until one day, we were driving it to go skiing. When that thing hit 32, ever bridge we went over was frozen. The roads were a bit wet because it had drizzled a bit. I was shocked at how accurate it seemed. After that, we decided to check it against a thermometer... It was dead-on!

Since then, 20+ years have past and Chrysler can't get the outside temp right, within a deg or so? There's something wrong with that.....
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  #26  
Old 02-12-2013, 06:43 PM
Asur Asur is offline
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You have to take into consideration also the location of the sensor, if the engine is warm or if its even sunny outside, the last known temperature assessed by the sensor. The sensor is located in the front of the vehicle, usually in front of the radiator. The sensor will only assess the current temperature while moving, it usually takes about 5 - 10 min for the sensor to assess the current temperature of the air passing over it and this is while moving. Its accuracy will depend on many factors, even more so when its wet or in a wet environment.

Maybe this can help

"The outside temperature sensor is usually located at the front of the vehicle and in front of the Radiator. The gauge control module uses measurements from this sensor to display the outside air temperature. Because of the location of the sensor, it may be affected by heat, reflection from the road, engine and radiator heat or hot exhaust from surrounding traffic. These conditions can heat soak the outside air temperature sensor and cause inaccurate readings. Logic has been written into the gauge control module to help prevent abnormal of fluctuating outside air temperature indicator readings. Outside Air Temperature lndicator Logic Initial outside air temperature indication after the ignition switch is turned ON. If the engine coolant temperature is 140 F (60 "C) or higher when the ignition switch is turned ON or the outside air temperature will be indicated the last reading before the key was turned off regardless of the current temperature measured by the outside air temperature sensor. If the engine coolant temperature is 139 T (59 "C) or lower when the ignition switch is turned ON, the current temperature measured by the outside air temperature sensor will be indicated. Update to the outside air temperature indicator while driving If the temperature measured by the outside air temperature sensor is greater than the temperature on the outside air temperature indicator, the outside temperature indicator will increase by 1 T (1 "C) per minute after the vehicle speed is greater than 19 mph (30 kmlh) for more than 1 minute and 30 seconds. It will continue to increase until the current outside air temperature is indicated. So, the first change to the outside air temperature indicator is 1 minute and 30 seconds after the vehicle speed is greater than 19 mph (30 kmlh). If the vehicle speed drops below 19 mph (30 kmlh), the indicator will not update again until the vehicle speed is increased to 19 mph (30 kmlh) or more for more than 1 minute and 30 seconds again.
If the outside air temperature is less than 140 T (60 "C), the temperature increases 1 T (1 T) every 2 seconds until the current outside air temperature. If the outside air temperature is less than the indicated temperature, the temperature will decrease 1 'F (1 T) every 2 seconds until the current outside air temperature is indicated regardless of vehicle speed. This is the standard Modual logic for assessing outside air temperature."

Hope this helps.
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  #27  
Old 02-12-2013, 07:10 PM
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I believe the sensor is in the driver side mirror.
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  #28  
Old 02-12-2013, 07:18 PM
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Yep. 2013 has the sensor in the drivers side mirror. I replaced my mirrors with tow mirrors that don't have a sensor in them and mine says -40 now lol
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  #29  
Old 02-12-2013, 07:35 PM
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Most temp sensors are located in front of the radiator or behind the front bumper, ok the ram 2013 may now have it in the mirror, the reason for the original above post was not to figure out its location but how the temp sensor and the temp units logic works. Want or not want, its still in a black plastic box, affected by other things than just the temperature, my original post still stands as logical functioning of the Temp sensor and its programming to give people a better idea of how it works and why it can be less accurate than your house thermometer.
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  #30  
Old 02-12-2013, 09:22 PM
Zixxer Zixxer is offline
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Quote:
Originally Posted by RamTech View Post
If I were that concerned about outside air temp, I would install a thermometer from an aircraft.
For me, I do look at it every day...it's a quick method v. pushing through screens on the radio display.

I agree with the other posters...my Tahoe in 2000 was spot on, so were my Fords and even my 2012 Ram...this one is just off by way too much. If they didn't want to get it right, don't display it and just use the information for internal engine settings. But they do, so get it right or close enough to not really complain about. 8 degrees is unsat.

I have 99 cent stick on gauages for my beer making that are more accurate...just sayin.
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