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Chevy 2500 Snowplowing

Old 12-21-2010, 03:06 PM
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Default Chevy 2500 Snowplowing

Does anyone have any experience plowing with a Chevy 2500HD LTZ? The temp sensor gets all screwy with the plow mounted on. Says that its 100 plus degrees outside and the heat blows cold. I know it has something to do with the digital/auto heat and the sensor for outside temp.
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Old 12-21-2010, 03:15 PM
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My Avalanche did the same thing,and my 2500HD Silverado had an issue with temp reading on rear view. Nothing to do with a plow being mounted. I googled it and came up with a series of adjustments using the knobs and it fixed it. Forgot how.....
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Old 12-21-2010, 07:33 PM
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Only happens when I'm plowing. Can be an issue when you need defrost and its blowing cold air.
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Old 01-26-2011, 06:27 PM
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Tried to move the sensor more to the outside of the grill. At least I think it was the sensor. Still doesn't read correctly. Any ideas?
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Old 01-26-2011, 07:05 PM
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From the service manual (probably know this). If the display and the HVAC are both not working, it may be that the reading is looking so odd that a HVAC sensor rationality may be defaulting (thinking the reading is out of whack).

Outside Air Temperature
The ambient air temperature sensor is a 2-wire negative temperature co-efficient thermistor mounted underhood, the HVAC control module uses the signal sent by the ambient air temperature sensor to ensure optimal performance of the air conditioning system. The HVAC control module will also send the temperature information by way of a serial data message to the body control module which in turn sends a serial data message to the driver information center which will display the outside temperature in either degrees Celsius or Fahrenheit.
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Old 01-26-2011, 07:12 PM
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My ninja search powers:

http://www.plowsite.com/archive/index.php/t-114166.html

Airflow looping back through the radiator. Relocate the sensor or try running the HVAC settings on manual.
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Old 01-26-2011, 08:06 PM
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I'll add a wrinkle. My suburban does this occasionally but the rear view mirror temp is correct (not sure if related) It blows cold air on the drivers side only even if set at 90. Passenger side zone blows warm..... is this a similar issue or no? 05 LT with dual zone auto climate and rear control.
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Old 01-27-2011, 04:07 AM
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Time for a New Battery
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Old 01-27-2011, 04:17 AM
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my 04 2500 did it I call it a lack of air flow due to the plow never did it when off
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Old 01-27-2011, 06:30 AM
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in my 07 2500 HD my temp reading on the mirror always reads 5*+ higher when I have my front winter cover on
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Old 01-27-2011, 12:53 PM
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Default Flip that baby to manual.

My GMC routinely reads 80 when going down the road with plow on, though its not nearly that outside. If you've got a manual override that might be the simplest solution.
T
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Old 01-27-2011, 01:01 PM
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that happened to me a little bit today. plowing with dodge ram 3500, initially outside air temp said 21 degrees.

then i drove on highway a few miles and then it said 45 degrees. must be due to weird airflow.


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Old 01-27-2011, 05:22 PM
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Originally Posted by ericinmich View Post
My ninja search powers:

http://www.plowsite.com/archive/index.php/t-114166.html

Airflow looping back through the radiator. Relocate the sensor or try running the HVAC settings on manual.
For a Floridian, that was a pretty cool web forum to browse through.
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