Question about 2003 Chevrolet TrailBlazer

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TrailBlazer A/C Problem

I have a 2002 Trailblazer and I have had some problems with my A/C lately. First the outside temperature sensor was reading 50 F no matter what temp was outside and the A/C blowing hot air, I cleaned it and researched online and found a way to reset it by pressing MODE/FRONT-REAR DEFROST at the same time, it seemed to work. Now I have a worse problem, the A/C seems not to work. I put it on AUTO and nothing happens, when the car goes over 40 mph then I can feel a little cool coming off, at over 80 mph it gets a little better but I have it in MAX and only blows like the minimum, do you know what could be causing the problem?

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You probably need an ac service

Posted on Nov 14, 2008

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Posted on Jan 02, 2017

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1 Answer

My external temp. gauge is reading 1 degree when its hot outside. where is the ambient temp. sensor located and can it be changed by myself?


The external temperature sensor is usually located directly behind the grille and in front of the radiator. It should be relatively easy to find because it will be the only thing in that area with wires.

May 24, 2015 | 2002 Chevrolet TrailBlazer

1 Answer

Where is outside air sensor


check the grill, they are located along the side if i am not mistaken and they do get dirty

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Will a bad temperature sensor cause ac to not function properly? on a 2002 chevy trailblazer with auto climate control.


yes, a temperature sensor inside the cabin if off will cause it not to function correctly.

Jul 20, 2010 | 2002 Chevrolet TrailBlazer

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If you mean the temperature display on the rearview mirror, you need to replace the outside temperature sensor. It is located under the hood, on the radiator support on the top near center.

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Ambient air temp sensor could be the cause. Normally located in front grille area.

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