Question about 2002 Chevrolet TrailBlazer

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Air cond on 2002 trailblazer

I have a 2002 trailblazer and the engine wants to shut down when i turn on the air cond.

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This has been a regular problem on the 4.2 vortec motor. Usually the Throttle Body has to be cleaned. Even with as many as 30K miles. Easy process.. When you do this you must unhook the neg battery cable to reset the PCM. They make a throttle body cleaner (different than Carb/choke cleaner). You can get it at any parts outlet. Trailvoy.com has a article describing the whole process step by step. Takes about 30 minutes. Do a search in the article section under throttle body cleaning

Posted on Mar 08, 2009

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What causes our 2002 trailblazer to shut off every time we connect the wire to the air condition accummulator


Problem could be the AC compressor going bad, or more likely, the throttle body needs to be cleaned thoroughly front back sides. Also, the PCM (computer) needs to be reset to allow it to relearn to the newly cleaned TB.

Jul 10, 2014 | 2002 Chevrolet TrailBlazer

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My trailblazer will shutoff if I turn the air on when I crank it. what is the problem?


What's the problem?

You make it sound like you never need a technican
or skilled mechanic to diagnose any vehicle,sorry,they
are very high tech & beyond the driveway fix, of thirty
years ago

You have a check light on
So you should know that we would need any codes
you should have gotten by now

Need a repair shop to diagnose

I can't believe in the past 20 years, you have not had a check
lights & vehicle issues at least once a year

Aug 01, 2012 | 2002 Chevrolet TrailBlazer

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When I tried turn on air cond. or heater the motor try die on me what is that? it's on my 2004 trailblazer


Bad compressor this work also when heater is on. To check have someone turn on ac/heater make sure clutch on air comp is turning. If not comp clutch is frozen

Jun 05, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Dealer says compressor for air cond needs to be replaced. i dont think s because when air cond is off still makes the same noise.what do you think? joe oh is a 2004 trailblazer


Get a second opinion. The ball bearings do go out in these compressors prematurely, but will only make the sound when it's on or engaged. You may have another pulley making the noise, or the tensioner, or possibly idler pulley. Could be many things, but doesn't sound like it is the compressor making the noise. Could be a failing water pump too...... Take the serpentine belt off, and turn the engine on. Do you still hear the noise? This little test will eliminate a few possible problems for you.

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2 Answers

Car shutting off when air condition is turn on causing it to stall


There is a switch that works the computer upon turning on the air conditioning. Upon turning the AC on the switch sends a signal to the computer to increase the RPM's to the engine so it will not die out

Jan 16, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Air cond dash light works, compressor doesn't go on.


AC's have a low freon switch that shuts off the system to protect the compressor in the advent that you have a freon leak have the system checked for a leak

May 28, 2009 | 1996 Toyota Camry

1 Answer

Check engine light on


I would think there is a problem with a sensor which my be an IAC Sensor. That makes the idle air control Hi or lo depending on what the motor is calling for. Have a shop take a computer reading and see what sensor is bad, As for the air There is a Air condition Amplifier and there may be a problem with that its not common but sounds like it may be the problem with your trailblazer. I sure hopes you out Flash68, If not get back to me and we can trouble shoot some more. Take care Bear001

Jun 02, 2008 | 2002 Chevrolet TrailBlazer

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