Question about 2002 Chevrolet TrailBlazer

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Lights on dash stay on and ac/heat fan does not work.

My 2002 trailblazer was running fine. I stopped at the store and when I started it back up the ABS, Brake, Check 4 wheel drive stay on all the time and the fan for the ac/heat does not work. I have checked the fuses and relays under the hood and under the backseat but haven't found anything blown. I went to autozone and the alternator is fine and the battery is holding charge. Can anyone help? My fan wont disengage so i changed the air filter, seemed like a good idea but ever since all dash lights wont shut off, abs, check engine, 4x4 and my airconditioner doesnt work or my cruise control. I've only got 22,000 miles on this thing but i live in vegas and its hotter than Africa here can any one help please. This is too crazy. Your problem is exaclty like mine. I changed the air filter because of the roaring that was coming from the engine; I thought maybe the engine was starved for air. I've since learned that the fan clutch assembly on Trailblazers is notoriously bad. Now, I'm not so concerned with the fan, but I have three idiot lights on constantly, I have no cruise control and no a/c. Does anyone have any ideas what the problem may be? I live in Las Vegas so I need the a/c. Please help.

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Your Ignition switch is not feeding 12 volts to the orange wire it feeds the accesory circuit. mine was melting poor design..

Posted on Nov 12, 2009

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Check rear fuse block under drivers side rear seat may need to remove fuse block under fuse block there will be an orange wire with terminal damaged

Posted on Nov 27, 2009

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Should Still Be Under Warranty 3Yr,36.000 miles Take it in!

Posted on May 30, 2009

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1 Answer

On my 2002 Trailblazer, when I start the engine, all my dash warning lights on and gauges stop working, the speedo and tach still work.


There is a known problem with the ignition starter switch that causes this, this is the switch that the ignition key operates when you turn it.

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Did you check in the fuse box in thje engine compartment?

Dec 06, 2012 | 2006 Chevrolet Trailblazer

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AC works fine at first then stops blowing thru dash vents and will only blow thru defrost and floor vents. this is an 02 chevy trailblazer. It this an expensive thing to fix?


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

Jun 21, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

03 trailblazer over heating when ac is running


Make sure the cooling fan is coming on when the ac is turned on,if so,see that the condenser is getting enough air,no fins stopped up in the condenser or radiator,if all this is fine,then you need some ac gauges on the ac system to tell if there is a restriction in the condenser.

Apr 08, 2010 | 2003 Chevrolet TrailBlazer

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My 2002 trailblazer blower was working intermittently, when it stopped I pounded the dash and it would work at speed 5 only. It now stopped completely. I thought it was the resistor and replaced it. That...


the fan switch is more than likely at fault since its a plastic part and the wiring will make this switch melt down through the years. they do short out and thumping your dash did kick it back on at one time you stated

Feb 20, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Both radiator fans on my 2002 Toyota Solara V6 run constantly


Check to see if the radiator fan relay has gone bad and needs to be replaced. Once you located the relay, (in the fuse box under the hood) Try swapping it out with another relay and see if the fans stop, if the fans stop working with the swapped relay, replace the relay. It's know for the relays when they go bad to stick and will have a close loop. Good luck and hope this helps. Keep me posted, be glad to help you get your car running 100% again soon.

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All warning lights flashing on dash of chevy trailblazer 2003. Runs fine all gagues go dark like truck is turned off but runs fine


All warning lights flashing on dash of my 2002 chevy trailblazer. Runs fine all gagues go dark and turn back on every now and then. Also the gagues all go to the right or stick half way like I am idling at 5000 and going at a speed of 60mph when I am sitting still. I am thinking it has something to do with my computer because the rest of the truck is working just fine.

May 18, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

The blower fan only works in position 5.


Replace the fan resistor in the heat/ac box, passenger side, under the dash, should be a plug with several wires on it. After you pull the plug off there will be a couple of screws that hold the resistor in, take it with you to the parts store, or dealer. to make sure they give you the right one, because electrical parts are not returnable.

Mar 20, 2009 | 2003 Chevrolet TrailBlazer

3 Answers

2002 Chevrolet Impala overheating while idling


the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.

Dec 11, 2008 | 2002 Chevrolet Impala

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