Question about 2002 Chevrolet TrailBlazer

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The fan on AC/heater fan on my 2002 trailblazer stopped working. It initially started with 1,2,3 setting not working then 4 and 5 stopped. From what I can tell it is a fan control module. How difficult is it to replace this and how would one go about doing it?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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tripletauto
  • 1450 Answers

SOURCE: 2002 Chevy Trailblazer idle down cut off when heater or AC is on

most of the time computer just needs to relearn itself. should straighten itself out after a drive.if not try cleaning the throttle plate

Posted on Dec 03, 2008

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tripletauto
  • 1450 Answers

SOURCE: 2002Chevy trailblazer engine cuts off when heater & ac is on

remove the airintake boot and clean throttle butterfly with a rag and carb cleaner

Posted on Dec 03, 2008

  • 383 Answers

SOURCE: WHERE DO I FIND THE AC/HEATER FAN MOTOR SWITCH ON

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

countrysi248
  • 443 Answers

SOURCE: HOW DO I FIX THE AC/HEATER BLOWER FAN ON MY 2004

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

Posted on Apr 22, 2009

  • 1 Answer

SOURCE: ac/heater control module

I have a 1989 Olds 98 Reg. Bro. I have recently located my ac control module under the hood on the firewall. removing it should take about 20 mins depending on whats in the way. but to cost to replace is the kicker. I found the part @ NAPA for $240.00. may i suggest craigslist.org and look under parts for your car or one like it. the car made like mine would be a 1989 Cadillac DeVille. I hope this helps.

Posted on Aug 15, 2009

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1 Answer

The fan on my heater/ac stop working on settings 1-4 for awhile it worked on #5 but has now stopped altogether


The blower resistor has gone out but if blower is no longer working on speed 5 then either the blower motor is bad as well or the pigtail connector to the motor are bad. Check the plugs to the resistor and to the blower motor for insulation damage discolored or melted wiring.

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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

3 Answers

Heater blower stops working


Hmm, a problem that I have not encountered before. My best guess is that some component within the heater setup is getting overheated and then it shuts off to avoid further damage. If the heater runs each time you start the car and then turns off during your travels, then this might be the case.

Secondly, there are circuit breakers located in the fuse box. These are silver and are about twice the size of a standard fuse. Unlike a standard fuse that blows once and is done, circuit breakers get hot and "trip". After they cool down the connection is made again. Look to see if a circuit breaker (sometimes labeled CB) is in the fuse box and serves the heater. You may want to get a new one.

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3 Answers

The heater/ac fan only works on speed settings 4 & 5


you might check your switch sounds like to me that your two lower speed sides of the switch maybe burnwed out.

Dec 19, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Only 4 & 5 speeds work on the AC fan dial...1-3 do not blow any air but you hear the AC kick in


There is a blower control module in the heater case that is known for going bad.Also it will sometimes burn where the connector plugs in.

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The blower fan speed control stopped working


usually a bad blower resistor is at fault...

Feb 05, 2009 | 2002 Pontiac Grand Prix

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2002Chevy trailblazer engine cuts off when heater & ac is on


remove the airintake boot and clean throttle butterfly with a rag and carb cleaner

Dec 03, 2008 | 2002 Chevrolet TrailBlazer

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