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Old 06-08-2013, 06:36 PM   #1
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Outside temperature not updating at low speed

Drove about 20 miles today off road today never exceeding 20mpg (mostly less than 15mph) and the outside temperature shown never changed from 80 degrees (it was clearly warmer as the day progressed). As soon as I got on the freeway, it jumped to 91.

Is this normal behavior?

Deven

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Old 06-08-2013, 06:53 PM   #2
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Mine does that too and I seem to remember something about that in the manual. Could be to help eliminate engine temps influencing the display at slower speeds.

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Old 06-08-2013, 06:57 PM   #3
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That's so funny I just noticed that today on mine and I was gonna start a thread on it. I was driving it started at 88 then jumped up to 94 it got all the way to 100 and I know it wasn't even close to that then it went back down to a realistic temp. Not sure if this is normal. Anyone else have this happen. If so is this normal?

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Old 06-08-2013, 07:02 PM   #4
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That's so funny I noticed the same thing on mine today. I left the mall and the temp showed 88 then it jumped to 94 eventually got to a 100. Which it wasn't even close to that. It was constantly changing up and down. Eventually it leveled off. This was all during city driving. Not sure if this is normal either.
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Old 06-08-2013, 07:05 PM   #5
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Sorry bout the double post IPhone froze on me
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Old 06-08-2013, 07:17 PM   #6
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The temp gauge does not change if below 25MPH. It will maintain it's last reading until then. There was a thread about this before. I cannot find it.

Bob K.
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Old 06-08-2013, 07:21 PM   #7
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Kudos to Cosmic Charlie. From another thread, same story:

"The system will display the last known outside temperature when starting the vehicle and may need to be driven several minutes before the updated temperature is displayed. Engine temperature can also affect the
displayed temperature; therefore, temperature readings are not updated when the vehicle is not moving."


That's all the Owner's Manual says about it. But, I found this explanation on another forum:

Here is the ambient temperature sensor behavior for the JK:

Vehicle with the key off for more than 4 hours...The CCN will update the ambient temperature reading immediately.

Vehicle with key off for more than 2 hours but less than 4 hours....The CCN will update the ambient temperature reading immediately after vehicle reaches above 20 mph (with no duration constraint) and will update every 500 ms thereafter.

Vehicle with the key off for less than 2 hours...The CCN will
display the last temperature reading (which is stored in memory) just prior to the ignition being turned off. The CCN will not update the value in the display until the car has been driven at 20 MPH or above for 3 consecutive minutes. If the vehicles speed and drive time does meet the criteria the CCN will continue to display the stored value until the criteria is met. Once the criteria is met, then the CCN will update the display every 500 ms based off of the ambient temperature sensor output.
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Old 06-08-2013, 07:22 PM   #8
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Yes, it is normal. Under 20 or 25 mph, can't remember the right one now, the temp does not change. You have to go faster than that speed for about 30 seconds before it correct itself again.

Our Jeep measure high temp from day one. Showed 120 yesterday and it was only 112.
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Old 06-08-2013, 07:47 PM   #9
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Thanx a lot!!! Now that makes sense.
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Old 06-08-2013, 11:14 PM   #10
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Yeah there is a thread somewhere in which a jeep engineer explains that they only update the temp when you're moving at a faster speed because the sensor is in the grill near the radiator and if you're moving slowly the heat from the engine compartment will bogus the number.
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Old 06-09-2013, 07:21 AM   #11
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Another JK Mystery Solved

Love this forum..
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Old 06-09-2013, 02:14 PM   #12
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Thanks, glad to here this is normal and to understand why.

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