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

I cut the bad connector wires all at once and blew...

2010-02-07T22:35:49.668-05:00

I cut the bad connector wires all at once and blew the 40 amp fuse under the hood. Disconnect the battery before starting this repair and save yourself time and money.

Replace the blown 40 amp BLWR fuse in the underhoo...

2010-01-05T20:18:26.583-05:00

Replace the blown 40 amp BLWR fuse in the underhood fuse box and all will be well.

Sparky, HELP! 2005 Silverado Started having probl...

2010-01-05T19:27:01.053-05:00

Sparky, HELP!
2005 Silverado

Started having problems with the AC working intermitantly. Would smell strong electrical. Then it stopped working on the highest setting (5) all together, but worked in every other position. Just replaced the resistor and pigtail and it works great on every setting other than high (5). Is it possible I have damage at the switch? When I replaced the parts, the black was where the 'heat' was, melted the connector and wiring pretty good.

Thanks!

Sparky, This is exactlly what happened and I was ...

2009-10-13T23:16:15.212-04:00

Sparky,

This is exactlly what happened and I was able to regain speed control to my blower. I have sent this along to a friend with the same problem... his is an'06 Silverado.

I had the a similar problem with my 2004 Chevy Sil...

2009-09-24T20:57:29.279-04:00

I had the a similar problem with my 2004 Chevy Silverado, but only found that the circuit board on the original resistor had burnt and I lost speeds 1,2 and 3. However what I found trying was a replacement. I got one from my local parts store and when they asked me if it was 2 or 4 hole I told them 2 since that's all that was on the actual resistor. What I didn't realize was that I had to have the 4 hole because the 2 does not line up with the mounting holes due to the cover of the original being where the two screws mount the resistor to the heater assembly and the cover does not fit over the new one. The 4 hole is $20-$30 more than the 2 hole, but it worked. Thank you for your help, it was an easy fix, you saved me another headache and a bunch of money! I have already referred others to your site.

Sparky, Awesome information. My brother-in-law, w...

2009-09-19T15:56:48.125-04:00

Sparky, Awesome information. My brother-in-law, who is Mr Goodwrench, and a top notch mechanic (mostly Buick), didn't tip me off to this. He had been 100% on his helpful info to date. I had already bought a blower motor from the scrap yard on his recommendation. "E" & "G" were melted beyond recognition, and the clip was melted to the resistor, with some collateral damage to a couple other wires. I am going to order the parts from you right now. Thanks for the helpful information. You saved me a bunch of time and screwing around!

Thanks Sparky- you helped me find the problem. I'...

2009-09-13T14:02:22.024-04:00

Thanks Sparky- you helped me find the problem. I'll be ordering the part from you as soon as I finish writing this.

My 2004 Silverado with 114,00 miles started giving a blower problem last year. I still had setting #4, but no 1,2 3 or 5. Since it still had #4, I contined to drive it. Yesterday, #4 went out. A quick search on the internet and I found your site. Thanks.

In my case, I looked at the resistor connector and the resistor itself. On the resistor itself- prongs for wires A and B were fine. Wire "C" was slightly darkened. "D" prong was fine. "E" prong was melted and rusted. "F" prong was rusty. And "G" prong? Well G did not exist any longer. There was nothing but molten plastic in the area that used to be "G".

I'll be getting the one-piece resistor, and the harness plug. I don't know who the electrical engineer at GM was who said this was an adequate design. I may end up beefing up the wires myself for good measure.

Thanks again.

Jim

You don't. If you have a three wire connector you ...

2009-09-12T09:32:47.226-04:00

You don't. If you have a three wire connector you have auto a/c controls and you are dealing with a blower control module and not a resistor.

We have similar problems with the 03 trailblazer. ...

2009-09-11T11:41:16.927-04:00

We have similar problems with the 03 trailblazer. I bought a new resistor and harness. The old harness has three wires and the new one has seven wires. How do I make this work?

Is your orange wire in position "F" of the seven w...

2009-08-28T13:21:44.779-04:00

Is your orange wire in position "F" of the seven wire connector? If so you have a switch or wiring problem. If it is in position "G" you have a blown fuse in the underhood fuse box.

Sparky, Fan went out completely. Took resistor out...

2009-08-26T23:11:13.519-04:00

Sparky, Fan went out completely. Took resistor out and at the plug the black wire show evidence of overheating. Bought new resistor and plug installed them and still no fan. Pulled plug and I have power to all the wires while selecting positions 1-4 but nothing on the orange wire in position #5? Any advise???

Yes,if you can unplug it you will see burn damage....

2009-08-22T17:31:13.948-04:00

Yes,if you can unplug it you will see burn damage. To have a lasting repair you must replace the resistor and harness connector at the same time. Replacing one without the other will lead to a very quick failure. To order parts be sure to go to www.The-Electric-Connection.com

Another problem. My 99 Suburban blower works in a...

2009-08-22T14:56:48.638-04:00

Another problem. My 99 Suburban blower works in all postions very well and MOST of the time on high ok. The red wire for the blower is a DIRECT feed and gives the blower full 12v. When the blower speed is on anything but high, power goes thru the resistor module. Occasionally, we have to slap the wire harness down underneath the dash on passenger side to get it to turn on in high mode. I then felt the connector that connects the two red wire ends and it was hot as fire. also, the red wire was hot about six inches or so on either side of the black connector. Does this mean my connector is bad?

Hi Mike C, You either have a blown fuse or a poor...

2009-08-17T17:21:57.300-04:00

Hi Mike C,

You either have a blown fuse or a poor connection at the blower speed switch. It is very common for the terminals on the brown and orange wires to be heat damaged and so loose that they do not make contact with the switch terminals. In the future please contact me at the
info@the-electric-connection.com address.

Thanks, Sparky

I agree with everyone here..this has been a very u...

2009-08-15T22:42:06.502-04:00

I agree with everyone here..this has been a very useful site for a mediocre weekend mechanic like myself. Unfortunately, I have not resolved my problem. I have a 97 Chevy Silverado Z71. Blower was working on high only, but this morning I turned off my truck and the blower kept blowing. I came home and replaced the blower speed control switch, the relay switch down by the blower, and the resistor (not a job for someone with fat hands). I inspected the resistor and relay switch wiring harnesses and saw no scorched or damaged wires or marks on the harnesses. After all was replaced, still no blowing. Relay harness is 5 prong, with red wire being hot and purple wire going straight to blower. Resister harness is 4 prong. I tested all wires on resister harness and had no power to any of the wires. Checked all fuses in the cab on fuse panel and under hood, nothing blown. Could there be an inline fuse between the relay and resister harnesses? Does power for the resister come from one of the wires coming from relay harness? I hot wired the blower straight from the red hot wire of relay harness directly to the metal prong on the outside of the blower, and blower worked. Purple wire from relay harness goes straight to blower, so I used a jump wire from the red hot lead on the relay terminal over to the purple lead on the relay terminal and blower worked again, but when I plugged in the relay switch, no blowing. Could control panel in dash be defective and not allowing any power to get to the relay switch via the blower speed control switch? Blower also does not blow as hard as it should? Any help would be greatly appreciated....it's getting hot in West Texas!!

Thanks. This post is the best. It took very little...

2009-07-25T12:57:17.130-04:00

Thanks. This post is the best. It took very little time and was right on the money. I would not have had a clue as how to isolate the problem and then fix it. The notes and directions you had on checking the voltage on each pin was great and I was lucky enough to only have to replace the resistor. Boy was it fried. Again, thanks,thanks,thanks.

Great info. Did gm never issue a recall on this f...

2009-07-25T12:10:40.378-04:00

Great info. Did gm never issue a recall on this for the fire hazard.

thanks! i had the problem where my ac would work o...

2009-07-23T16:09:40.551-04:00

thanks! i had the problem where my ac would work on high only and checked the harness and all looked good and i had voltage everywhere you said i would have voltage. so i change only the resistor out and it worked like a charm. so i'm here to just say thanks. this problem was on a 2007 classic chevy crew cab just thought i leave a comment to maybe help anybody that was in the same situation that i was in. i hope i don't need much help from this site in the future but if i do i know where i'm going to check first.
thanks again

Makes for a good emergency repair but will not las...

2009-06-11T08:34:04.162-04:00

Makes for a good emergency repair but will not last long. You are correct that heat is the problem. Keep in mind that the black, ground wire is between two hot wires and as it heats again, as it will, you will have short that hopefully will only blow a fuse. To properly repair please replace the connector and resistor at the same time and ASAP. You can find the parts you need in our online store by clicking here.

Hot in FL and my blower stopped working it had bee...

2009-06-10T21:23:39.195-04:00

Hot in FL and my blower stopped working it had been on high for about 5 minutes into the ride,I immediately turned around and came home took dash apart checked for loose connections and fuses everything was fine I looked up blower problems for 2005 Chevy Sparkys Answers popped up I am no sort of mechanic but with your photos and directions I was able to find that the black wire had melted to plug of resistor I scraped black plastic from metal strip or whatever and inserted an old part of a staple made sure nothing was touching pluged it back in and I had an AC again..! Thank you so much. I did notice that it had became real hot prior to using the paper clip though I guess a loose connection isnt good. Thanks Again

All I can say is "you are my new best friend" Save...

2009-03-31T12:29:00.000-04:00

All I can say is "you are my new best friend" Saved me a $89.00/hr shop charge

On most of the later model trucks there is a finge...

2008-11-23T19:33:55.369-05:00

On most of the later model trucks there is a finger lock that need to be released and then the motor will twist like a light bulb and pull out. I will try to find some pictures soon and add them to the blog.

GREAT TIPS/PIC'S THANK YOU. NEXT HOW DO I CHANGE...

2008-11-23T18:45:00.000-05:00

GREAT TIPS/PIC'S THANK YOU. NEXT HOW DO I CHANGE THE BLOWER FAN???

I just paid over $170 for the resistor and harness...

2008-10-24T19:21:00.000-04:00

I just paid over $170 for the resistor and harness at the local Chevrolet dealership, feeling this was a bit much and armed with the part numbers, I found the Electric Connection!! I will be returning these parts to the dealership Monday and ordering from you, thanks a ton. Now if I can just figure out what to do with that extra $100........

Thank You!! This post saved me alot of time. Using...

2008-10-16T17:08:00.000-04:00

Thank You!! This post saved me alot of time. Using the great instructions here I fixed the problem easily. Thanks again