Question about 2002 Chevrolet TrailBlazer

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I have a 2002 LTZ model Trailblazer. The outside air temperature gauge displays a very low temperature sometimes as low as -30, this makes the air conditioner blow out hot air.

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  • Chevrolet Master
  • 1,311 Answers

You need to replace the temperature sensor, it is located under the hood, on the radiator support at the top near center.

Posted on Oct 12, 2010

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I have a 2008 Chevy Trailblazer. Problem started with the air conditioner blowing hot air and when it does this, I noticed the temperature gauge doesn't register anything.


Hi Christy.
It sounds like your BCM, (Body Control Module) is failing, or your Connector/Connectors to your BCM could be at fault. They could be corroded, Damaged, burned, loose, and/or could possibly have bad wires on or going to the connectors. I would take it to a mechanic that you trust and have them check it for you. Do you have a check engine light on? Hope this helps.

Nov 04, 2016 | 2008 Chevrolet Trailblazer

1 Answer

Air conit/2002 buick rendezvous


was system evacuate by pumping it down using vacuum pump to remove all moisture out of the system.most time of the time when i work on AC system you have pump it down from 30 minutes to a hour.pump it until low pressure gauge read 30 hgs in the green area.i shut down vacuum pump close off manifold gauge valves see if low pressure side reading stay at 30 hgs or drop if gauge needle stop dropping have leak in the AC system.if all is good you have temperature air door problems.air door not opening all cool air to circulate through AC vents.

Jun 21, 2013 | Cars & Trucks

2 Answers

Air conditioner comes on briefly then stops. The temperature gage on the panel which shows outside temperature is inaccurate sometimes giving a display of -27 degrees.


Well the outside temperature gauge is generally not wired into the a/c. The internal temperature is more important but is not displayed as such. The 'internal' temperature sensor is used to regulate the a/c blending door and blower speed.

When did the cooling problem start?

Aug 10, 2010 | 2002 GMC Envoy

1 Answer

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

1 Answer

Air temp indicator only reads temps below 50 degrees


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

Oct 06, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

How do I reset the outside temperture gauge


you can't reset it. Try replacing the sensor.

SECTION 412-04: Control Components 2002 Explorer/Mountaineer Workshop Manual
REMOVAL AND INSTALLATION Ambient Air Temperature Sensor Removal and Installation
  1. Remove the radiator grille. For additional information, refer to Section 501-08 .
  1. Remove the three upper pin-type retainers in the radiator air deflector.
  1. Position forward the air deflector.
  1. Remove the ambient air temperature sensor.
    1. Detach the pin-type retainer.
    1. Disconnect the electrical connector.
    • Remove the ambient air temperature sensor.
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Nov 23, 2009 | 2002 Mercury Mountaineer

1 Answer

Climate control display for Outside temperature


Had the same problem, replaced the ambient air temp sensor in front of the radiator. Cost is like 10-15 bucks. Don't worry if temp doesn't change right away. Took me about 5 miles and then it worked great.

Sep 13, 2009 | 1999 Oldsmobile Intrigue

1 Answer

The temperature display on the rear view mirror shows OC


The temperature display on the rear view mirror my 2002 Trailblazer LT is either way incorrect - like obviously too high or too low - but mostly just shows "OC" all the time. Is this an expensive fix? Is this an easy fix that I could do myself? What do I need to replace and how

Jun 30, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Low Beams Don't Work!


There is more than one relay I know but make sure your bulbs are good I HAVE seen this happen more than once.. low beams can go at once.. and still have hi beams check this first please .. Jerry

Apr 22, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

2002 Chevy Trailblazer Ltz won't start no lights


make sure the battery termanals are tight,, give it a jump and see, can't hurt.

Dec 31, 2008 | 2002 Chevrolet TrailBlazer

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