Comments on Sparky's Answers: 2005 Chevrolet Silverado Blower Inop

Your blower motor will need to be replaced. Please...

2012-01-09T09:20:24.364-05:00

Your blower motor will need to be replaced. Please read the information at the following post address. You will need to copy and paste it. Pay particular attention to the end of the article in red font.

http://www.sparkys-answers.com/2011/07/2003-gmc-yukon-bower-erratic-not.html

I had pretty much the same issues on my 2003 Trail...

2012-01-08T14:53:23.522-05:00

I had pretty much the same issues on my 2003 Trailblazer (with Auto), Blower running with key off. Replaced the resistor with harness(Echlin). Now I have have to pull the fuse while the truck is running to get the blower working. Otherwise everything works fine while the trucks running. Kinda like a computer reboot?

Thank you so much for the information. You have sa...

2012-01-08T12:36:40.959-05:00

Thank you so much for the information. You have save this single dad a lot of money.

Thanks so much for your post. I am a mother of th...

2012-01-01T19:08:06.229-05:00

Thanks so much for your post. I am a mother of three who is not afraid to at least try to fix something. This post and many others on your website saved me a bunch of money I am sure. I accessed the vent parts by taking off the black cover under the passenger dashboard. I first inspected the blower resistor wires. The wires looked good and were not burnt. When I unhooked them, the connectors looked fine too and then I looked at the blower resistor and the green computer chip was obviously fried. I ordered the part through your link and it came in 2 days. I popped in the wires and was good to go. The repair took me all of 10 minutes once I found all of the tools I needed and I had no clue what I was doing. Thanks so much for the information in your post. I am so glad I did this repair myself!

The Trailblazer and Envoy use the same auto a/c, b...

2011-11-26T22:32:23.723-05:00

The Trailblazer and Envoy use the same auto a/c, blower speed controller so the following information should tell you what you need to know. As far as the voltage drop at idle, it is relatively normal but if it seems excessive and the battery has been disconnected in the recent past, the throttle plate may ned to be cleaned.

http://www.sparkys-answers.com/2009/09/2004-chevrolet-silverado-blower-will.html

I am having similar problems as this thread. I hav...

2011-11-25T21:47:04.703-05:00

I am having similar problems as this thread. I have an 06 Trailblazer where the blower either works or doesn't. Sometimes with it getting stuck on with the key off. When it is on I don't have control over the speeds, sometimes just a trickle and other times on high. It is an automatic unit with dual control. Also have noticed a voltage drop when idling. The battery and alternator have been changed recently. Any help would be greatly appreciated thanks.

Hi 2001 GMC, Assuming that your test of the lower...

2011-11-15T22:24:47.128-05:00

Hi 2001 GMC,

Assuming that your test of the lower speed circuits was accurate, the new resistor is faulty. The 7 wire connector will need to be checked with it disconnected and the key on. Most of the time a simple test light or voltmeter test will suffice but in unusual cases there will need to be a load applied to each individual circuit while testing. Ie a headlight bulb with one lead connected to chassis ground.

I have to assume that you connected a new fused wi...

2011-11-15T22:15:20.009-05:00

I have to assume that you connected a new fused wire to the brown wire terminal at the blower switch. There are other smaller brown wires that go to some of the other connectors. You will need to look at a wiring diagram to see how many are involved to see if you want to do the same bypass. I have been told by others that the wires can be damaged somewhere around the instrument cluster area. No personal experience with that though.

I am working on an 03 chevy 2500, single cab, base...

2011-11-15T20:35:50.935-05:00

I am working on an 03 chevy 2500, single cab, base model truck. Someone bypassed the resister and wired a jumper wire from the blower to a toggle switch.Only the a/c would work and only one speed on the blower. I removed the jumper wire and replaced the resister. Nothing on any speed. I checked the wires going to the harness and the red wire is hot. The rest are dead on any speed. I checked the fuses inside the cab and all are good. I then checked the brown wire going into the control panel and it is dead. I wired a jumper wire from the fuse box to the harness going into the control panel and got all speeds but 5, and no heater or defroster. Before I learned about the bad resister I replaced the control panel. Both the control panel and the resister were replaced with ac delco parts. Any idea what may be the problem?
Thanks
Randy

I have a 2001 GMC that was only working on 4 and 5...

2011-11-12T21:24:13.296-05:00

I have a 2001 GMC that was only working on 4 and 5. I replaced the resistor and changed the hvac fuse that is under the hood. I checked the resistor harness and all the connections look fine, no burnt look, etc.. Now I am only getting my blower to work on high. I checked the voltage on the harness and all are getting 12 volts on their settings. Any Suggestions??

Since you stated that you replaced the blower spee...

2011-10-26T22:30:52.531-04:00

Since you stated that you replaced the blower speed control unit, I am assuming that you have auto a/c controls and you installed part number 15-81728. If so the blower motor will need to be replaced. I have included a link address to another post that will shed some light on the subject. Copy and paste.

http://www.sparkys-answers.com/2011/07/2003-gmc-yukon-bower-erratic-not.html

Sparky, thanks for all your help but I now have a ...

2011-10-26T18:03:43.982-04:00

Sparky, thanks for all your help but I now have a different problem in my 06 Silverado 2500HD. My blower is acting very strange. After troubleshooting for hours I have firgured out what is kind of going on. Let me explain.. When I first turn key to RUN blower turns on, but when I start the engine the blower completely shuts off. Here's where it get's weird. When I shut engine off and turn key back to RUN the blower does not turn on.. So after a lot of frustration I figured out that if I wait 3-4 seconds before turning key to run the Blower will work. So in order for me to use the Blower while I am driving I have to turn key to RUN and then turn the Key towrads START just enough to kill the power to Control Unit but not start the engine. I have to hold it in this position for the same 3-4 seconds before starting engine for the blower to work. I am going crazy trying to figure this out. Have you ever seen or heard of this before? I have replaced the Blower Speed Control Mudule and I have swapped out the actual main control unit in the dash. Please help me. Thanks, Nick

With the blower on high, switch between max and no...

2011-09-28T18:07:30.505-04:00

With the blower on high, switch between max and normal a/c or push the recirculation button on and off. Allow 30 to 60 seconds for the recirculation door to fully move. You should, as you stated, be able to hear an audible change in the sound of the blower. If not the recirculation actuator is stuck. Probably happened when the battery was disconnected to work on the blower issue. I do not recommend disconnecting the battery to change the resistor harness. Instead, remove the 40 amp blower fuse in the underhood fuse box. Also make sure the ignition is off.

Actually they extended the warranty on that partic...

2011-09-28T17:05:17.821-04:00

Actually they extended the warranty on that particular problem, if the blower was to become inoperable on any or all speeds they would cover it under warranty up to 150000 miles. There IS a distinct difference in speeds at all 5 settings BUT before the "fix" I guess you could say there were two more speeds when the ac or recirculate was on. When set to 4 or 5 I got MAX ac which I don't get now but all the different speeds seem to be a lot higher then before I hope this is clearer, Thanks

No, it is not normal. There should be a distinct d...

2011-09-28T10:48:44.920-04:00

No, it is not normal. There should be a distinct difference in the blower output at every speed. What do you mean by no change with a/c or recirculate?

There is not a "recall" on the resistors and harnesses. There is a "campaign" for some full sized trucks and suv's. A recall would be mandatory and a campaign is voluntary at the manufacturer's discretion.

Also if you have it done, you stand the chance of something going wrong that will ultimately cost you some money. Just like you are experiencing now.

Sparky, I just had the dealer replace the resiste...

2011-09-27T17:38:44.466-04:00

Sparky,
I just had the dealer replace the resister and fix the harness on my 2004 Sierra. They fixed the harness and replaced the resistor for free because of a recall. The issue I have now is that the blower does not kick in higher on speeds 4 and 5 when the ac is turned on like it did before the fix. It seems as though the speeds are all higher now but with out the change for ac or recirculate. I have the duel climate control, not digital. Is this normal ? of course the dealer says it is.

I would suspect a faulty blower speed controller. ...

2011-09-22T12:57:53.594-04:00

I would suspect a faulty blower speed controller. have you done any testing or inspection?

hello sparky my name is ryan from wv i left work t...

2011-09-16T21:31:23.964-04:00

hello sparky my name is ryan from wv i left work turned on heater and it worked on low but the fan wouldnt turn up when i tried to so i cut vehicle off and turned back on and it worked on high but wouldnt turn down so i then cut vehicle off again and the heater kept running. i have pulled fuses and tried reseting it but it still works like it stated whatever speed its on when vehicle is turned off in is what speed it stays on. could u please tell me what might be wrong and where to begin adn what parts im looking at. thanks my vehicle is a 2007 chevy trailblazer with dual controls and either auto or manual heat controls.

You need both. The harness is damaged and it will ...

2011-09-02T09:00:25.184-04:00

You need both. The harness is damaged and it will transfer the damage to the new resistor.

I have a 2005 Chevy Silverado, and lost speed 5 ~6...

2011-09-01T20:05:57.892-04:00

I have a 2005 Chevy Silverado, and lost speed 5 ~6 months ago. I lost speed 4 today for an hour or two, and then it worked again. I went to my local chevy dealer on the way home from work, and he told me about the resistor problem. He also told me to check the wiring harness to see if it was burnt. There was one burnt terminal. Just to make sure he was right, I replaced the resistor and cleaned the burnt terminal and turned things on to see if it would work before I spent the money on a new harness. Speed 5 didn't work. I took the new resistor out, and reinstalled the old one so I can use the A/C until I can get to the part store to buy a new harness. After I plugged the old one back in, all of the speeds worked (even speed 5). Any idea why it suddenly started working?

Do I really need a new resistor, or do I just need a new harness?

Thanks,

David

The original circuit board type resistors had a hi...

2011-08-17T13:08:02.206-04:00

The original circuit board type resistors had a high failure rate.GM updated the resistor to the current heavier design. This created a new problem in that the wires were not heavy enough to handle the load and became the new weak point. It is strongly recommended that the harness be updated to the heavier design when the resistor is changed. Regardless of how "good" it looks. Preventative maintenance.

Why are you splicing wires during your resistor pa...

2011-08-16T20:46:00.941-04:00

Why are you splicing wires during your resistor pack change out? If the wires are not burned the resistance should be the same. Is there a problem with the OEM design that causes the stock blower resistor to fail? Seems to me the resistor pack should not fail.
I ask because I had a failure on my '04 Suburban blower and pulled the pack. Everything was dry as a bone, but the resistor pack was blown apart in two places. Funny thing to happen after 100K miles. Anyway, a check of the wires revealed nothing. No hint of burned wires.

What am I missing?

Yes it is. the mode actuator was worn and during t...

2011-07-11T22:05:56.515-04:00

Yes it is. the mode actuator was worn and during the recalibration procedure, initiated by the battery disconnect, it over traveled and is now stuck. Please read the article relating to this problem under the category "B0263".

I have a 06 Chevrolet Trailblazer. From reading t...

2011-07-11T21:01:53.383-04:00

I have a 06 Chevrolet Trailblazer. From reading the post it sounds like I need to replace the resistor. Could this also be the reason why the last two times I had repairs made to the vehicle (the ony common factor was that the battery was disconnected both times) that you can hear the ac blowing but nothing comes out of the vents. It will blow out on defrost but not on any of the vents.

Thank you. This made the repair so easy

2011-07-11T19:34:33.872-04:00

Thank you. This made the repair so easy