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Climate Control displays -5 degrees Ext

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Old Apr 25, 2008 | 05:01 PM
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Default Climate Control displays -5 degrees Ext

when its 75 degrees outside.Any one know whats causing this reading?

Last edited by gtzy; Apr 25, 2008 at 06:03 PM.
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Old Apr 25, 2008 | 05:39 PM
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Yes! It's mighty cold where you live!
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Old Apr 25, 2008 | 05:46 PM
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The external air temperature sensor has apparently failed...each GM model has a different sensor default reading.
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Old Apr 25, 2008 | 05:49 PM
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Originally Posted by gtzy
Any one know what this means?
Yes, it means the temperature outside the car is 5 degrees below zero.
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Old Apr 25, 2008 | 05:55 PM
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Originally Posted by dcd58
Yes! It's mighty cold where you live!
What global warming?
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Old Apr 25, 2008 | 06:05 PM
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Originally Posted by hotwheels57
The external air temperature sensor has apparently failed...each GM model has a different sensor default reading.
I thought the default reading is 69
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Old Apr 25, 2008 | 06:12 PM
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I honestly don't know what the default reading is on a C5/Z06...on my '02 Trailblazer is was something like 38 degrees when the sensor failed...
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Old Apr 25, 2008 | 06:17 PM
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Originally Posted by gtzy
I thought the default reading is 69
The "default" value is 69 ... but it is used when there is NO data coming from the sensor. Your sensor is sending data ... the HVAC has no way to know that it is incorrect......

Order part number 10248414, it is about $10.00 at the dealer ..... you might find it cheaper from a supporting vendor ... but for a part that cheap ... the shipping may out-price the dealer.

Install is 5 minutes, maximum ..... look in the frame rail area, passenger side .... almost directly below the headlamp. Once you see the new part you will know what to look for.

IMPORTANT: After replacing the sensor, you will need to drive the car for several minutes before the HVAC will start to take readings from the new sensor. People have installed a new sensor, started the car, seen the "old" temperature and thought that they still had a problem .... nope .... just go drive the car ......


Last edited by BlackZ06; Apr 25, 2008 at 10:26 PM. Reason: Add info about driving the car
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Old Apr 25, 2008 | 09:59 PM
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Old Apr 25, 2008 | 10:49 PM
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Thanks for the drawing.
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Old Apr 26, 2008 | 04:08 AM
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Originally Posted by BlackZ06
The "default" value is 69 ... but it is used when there is NO data coming from the sensor. Your sensor is sending data ... the HVAC has no way to know that it is incorrect......

Order part number 10248414, it is about $10.00 at the dealer ..... you might find it cheaper from a supporting vendor ... but for a part that cheap ... the shipping may out-price the dealer.

Install is 5 minutes, maximum ..... look in the frame rail area, passenger side .... almost directly below the headlamp. Once you see the new part you will know what to look for.

IMPORTANT: After replacing the sensor, you will need to drive the car for several minutes before the HVAC will start to take readings from the new sensor. People have installed a new sensor, started the car, seen the "old" temperature and thought that they still had a problem .... nope .... just go drive the car ......

After installing LEDs into mine I benchchecked the HVAC and it did indeed default to 69 degrees with no input from the External temp sensor.



Hey BlackZ06 are you ever wrong?????
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