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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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.

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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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My inside temp led didplay always shows 50 degrees for my 2002 trailblazer so the Ac won't blow really cold air


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.

Jun 15, 2010 | 2002 Chevrolet TrailBlazer

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Engine is racing


The vehicle should have a stored trouble code, go to an Auto Zone they will read the code for free. Usually idles surges are caused by a malfunctioning TPS sensor or throttle position sensor.

Oct 06, 2009 | 2002 Chevrolet TrailBlazer

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The climate control shows 50 when its 90 out. Changed computer same problem


climate control is adjusted manually to the interior and doesnt have a relation with the outside temperature

Aug 22, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Exterior temperature won't go higher than 50 degrees


REPLACE THE TEMP SENSOR IN FRONT OF THE RADIATOR AND SEE IF THAT CORRECTS THE PROBLEM.

May 04, 2009 | 2002 Chevrolet Trailblazer Ext

1 Answer

No ac


The ambient air temperature sensor is bad or has a connection/wiring problem. It is not blowing cold air because it thinks the outside air is less then 35degrees. When the computer sees outside air less than 35 it disables AC so that ice will not form inside the vehicle and in HVAC system. The sensor is directly behind the front grill. You might be able to check it for connection/corrosion/frayed or damaged wires. If no evidence of this I would replace it.

Aug 13, 2008 | 2002 Chevrolet TrailBlazer

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