Question about 2004 Chevrolet TrailBlazer

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WHERE DO I FIND THE AC/HEATER FAN MOTOR SWITCH ON MY 2004 CHEVY TRAILBLAZER

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Rickalber: The fan motor switch is within what GM refers to as the HVAC control unit. This is located in the dash, You actually touch part of it, which are the knobs.
Looking at the flat rate guide, it shows 4 tenths of an hour to change the part out and the part retails for $142.58
Are you sure you need this part?
What are the symptoms?
If the blower runs but only has high, it is not the switch, but the blower resistor! That part cost $24.00 but takes 8 tenths of an hour to replace according to GM.
Make sure of your diagnosis before replacing a part. All too often, I see people throwing parts at problems and spending small fortunes on simple problems. Had they only waited and gotten professional help.
I had a customer bring his car into my shop after he had spent untold hours trying to fix his car and nearly a thousand dollars in parts.
After listening to his discription of the problem, it took all of 5 minutes to pin the problem down and fix it. We found his problem which was a loose ground wire on his intake manifold which affected his fuel injection system. We happened to specialize in this product and the problem was quite common!
CAN YOU SAY HOPPING MAD?
We charged him about $50.00! He has learned a very expensive lesson. Mind you, this doesn't mean you shouldn't try to fix your own car, but make sure it is something you can handle and if the tech says he/she thinks it may be better addressed by a professional actually working on it, take their advice.

Posted on Apr 20, 2009

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04 trail blazer fan control only works on hi please help!!!!!!!!!!!!!!!!!

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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on May 25, 2011 | Chevrolet TrailBlazer Cars & Trucks

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OUR 04 TRAILBLAZER, THE A/C STOPPED WORKING, IT WOULD WORK SOMETIMES AND BLOW COLD AIR NOW NOTHING COMES OUT, OR THE HEATER TOO.. LITTLE AIR WILL PULL THROUGH IF ON THE HIGHWAY, I CAN HEAR IT CLICK OVER...


a couple of things,1 blower motor fuse.2 blower motor gone out.3 switch on fan speed control switch not sending signal to fans.after checking the fuses.next check theswitch on control panel.set ac or heater.if fan still doesnt come on then replace it.when it work and then stops working there are a lot of possiblities that caused the prob relay too not fliping over inside staying close loop.hope this helps.

Aug 16, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

No air coming out of the vents


It sounds like the heater motor may not be operating. When you switch the heater fan on can you hear the motor running? If not then it may have blown the heater fan fuse, check the fuse's and then try it again. If the fuse is ok then it could be a faulty switch or fan motor.

Apr 02, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

The heater/ ac fan on my 2004 chevrolet trailblazer runs on high only.


most probable problem is the multifunction fan switch test switch first if good- than need to test motor which would be the other problem

Feb 12, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Chevy Trailblazer, At first you could only get the air conditioning to switch on by turnning the vehicle off and switching over to AC. Now the AC will not come on and it is always blowing hot air out...


Could be your main blower motor resistor, mine would still run the fan even after shutting off the vehicle.(safari van) Had to unplug the resistor to stop the fan,it was near the blower under the hood. Bought a new one for about $45 bucks. Replaced it and all is fine. Might want to check relays first, sometimes they stick and need replacing.
Good luck.

Dec 10, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

MY 2004 CHEVY TAHOE AC AND HEATER FAN DOES NOT WORK. I HAVE AC AND HEAT BUT NO FAN. THE BACK FAN WORKS I HAVE CHECKED THE FUSE AND ITS FINE


It may be the heater fan motor or connection to it .
I have replaced a lot of these that required a new connector to make then work....as the original connector semi melted at the fan motor.

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HOW DO I FIX THE AC/HEATER BLOWER FAN ON MY 2004 CHEVY TRAILBLAZER. IT ONLY WORKS ON THE HIGHEST TWO SPEEDS 4 AND 5


Your switch acts as a reastat which adjusts your speeds your switch is going bad so you only have the two speeds left on that reastat.. thanks Jerry

Apr 20, 2009 | 2004 Chevrolet TrailBlazer

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