How-To: 05-06 GMC / Chevy Factory Electric Fan Wiring Harness Removal
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- เผยแพร่เมื่อ 16 ต.ค. 2024
- *These fans were never meant to run on a single HIGH Speed. Aftermarket harnesses that use that as an option are not fully taking advantage of the factory fans and can actually damage the wiring and possibly melt/cause a fire. These fans were designed to go to high speed from low speed, never from off to high speed. Because of this, the factory harness can burn up and the relay box can melt from extended use of a single high. Also use low speeds and then high speeds*
The two wires going to the PCM are: Green wire to Pin 42 of the Blue connector. Blue wire to Pin 33 of the Red connector.
This is a quick video to show how to pull a factory / stock efan harness from a donor 05-06 GMC / Chevy truck from a junkyard. We also show which wires you need to pull, which wires you need to hook up, and which wires you don't need. Also shows how to strip the harness down to get rid of extra wires not used and how to test the efans before you buy them. Enjoy!
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Appreciate the walk-through! Pulled a fan and harness today for my 04 Suburban.
Thank u guys really appreciate all th knowledge I’m doin a 2000 Sierra An learned ur channel from LT’s channel thanks to u guys An him an now I’m more at easy on doin this conversion gladly appreciate u guys God Bless 🙏🏽🙏🏽🙏🏽🙏🏽
Thanks for the vid, doing a swap . Trying to stay on a budget, headed to junkyard this weekend. Every little bit helps.....
It is definitely a nice upgrade. And if you can find all the junkyard parts for cheap, well worth it. If you get a set of the fans, and they somehow go bad, you can always upgrade to the 7 blade / 9 blade from the gmt 900s. The blades and the motors bolt right up to the fan shroud. the gmt 900 shrouds are a little different. TYC 622210 is the part number for the 7/9 combo. Pull a little more air for the same power draw.
Definitely using this video to E-fan swap my 02 extended cab 😎
Great video guys. This will save people lots of cash
Thanks for all the info doing my research for this project coming up
Thanks for the how to. You guys answered a lot of my questions
Excellent precise and informative video. Good job. The best tutorial I've seen on youtube.
hey man, i’m trying to wire up my e fans on my 99 silverado and you didn’t show exactly how you wired your toggle switches. is there any way you could show how you wired the switches?
I just want to thank you for your videos, I found a wire harness at the local wrecking yard I go to on a regular basis(LKQ), I got my fans from an ‘’10 Chevy Tahoe, but they are both 5 blades, do you all do tuning in the Houston area, I have an ‘02 Yukon?
Would the 06 efans work on a 95 silverado with a v8 engine just wondering
Hi,I just bought a 2006 Yukon factory fan wiring harness for my 2003 Silverado to convert over to electric fans from someone on marketplace!!These’s a black and blue wire going to one of the fans and the black one has been cut!! I think that each end of the black wire go a ground on the frame but I’d like to verify with you on that!! Thanks in advance!!
Yea. The black wire needs to be connected together and also spliced to a ground. In the video, you can see where the black wire extends to the passenger side frame horn. More than likely , they cut the wires under the fans and excluded that part. Splice the black together and add a same gauge wire connecting them to ground and you’ll be good.
Js yall awesome i just recently bought a 05 tahoe it has electric fans i changed relays checked if i was getting power but gona check the ground next and i changed the coolant temp sensor idk what to do with it to figure it out
awesome video brotha!!!
Incredibly helpful, thank you!!
One question, do these electric fans work for a 1998 Tahoe 5.7 Vortec engine? Let me know if those fans fit that type of engine, thanks.
I have a 2000 Silverado z71. What do you do if there is already a wire occupying pin 33 where blue wire goes? Please help the lost beginner. This only thing holding me back.
This is the recirculating command for the hvac. You simply remove that wire and cap it and tick it in the harness. It isn’t used anymore. But, you need to make sure you tune it correctly .
At the beginning of this video you said anything 03 and above is plug and play. Are you referring to the wiring harness or the PCM programming, or both. Example: 2004 Tahoe - plug and play? Does or does not need a PCM tune?
Thx
Either way, your computer needs to be tuned. The 03-06 are easier because there aren’t any pins in the spots where you are going to add the efan trigger wires. The 99-02 is a little more complicated in regards to wiring and tuning. 03-06 would just need the pins added to those two spots and a tune, nothing else.
Thanks man, great video
I have a 2005 2500 6.0 suburban with fan and I have a 2005 1500 5.3 with electric fans do I need to get 6.0 suburban tuned after installing electric fans
Yes
Alright thank you
Hey guys awesome video. My question for you is do I add a toggle switch to the red wire?
Just what I was looking for. i will be saving this for referral. Thanks fellas.
Glad to help!
Are the electric fan wires part of the headlight harness?
I believe they have the airbag sensors, horn, and fog lights in them. You unfortunately can’t just swap out the headlight harness. I looked into it. The 99-02 and the 03-06 don’t match up.
Appreciate your expertise is there anyway I can purchase efan harness from you?
Hello, by any chance can you tell me what hi/low temps the ECM triggers the fans on and off? Both fans have different temp settings, just want to make sure my settings are correct.
Sucks I can only give you 1 thumbs up great video
Thanks for the feedback!
Thanks for the video I enjoyed it, I did have a question about wiring e fans back into an 03 suburban without having to plugging into the PCM if it's possible thanks
Wiring the fans in without the pcm control would require you to use a temp switch, tying into the ac compressor relay, or using switches.
I have everything I need to do the install on my 2000, but on my OEM harness, my blue and green wires are short. Where would you recommend getting some extra wire and pins to lengthen the wires ? Thanks Pat and very nice video!
We’re you able to unpin them from the junkyard pcm? If not, you can use any 18/20 gauge multi-stranded automotive wire. As for the pins, you can buy them new from the jungle website: www.amazon.com/Micro-Pack-100-Terminal-Gauge-Female/dp/B0040CVUX0/ref=asc_df_B0040CVUX0/?tag=hyprod-20&linkCode=df0&hvadid=312142335725&hvpos=&hvnetw=g&hvrand=14591840470218904276&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9027420&hvtargid=pla-606001651638&psc=1
I have both pcm connectors that have the pins and a length of wire that’s I pulled from the jy just to have on hand.
Thanks. That's a cool trick with the battery.
Hey, did you take that spills floor mat liner with you? That looked like a great find. lol
To be honest, I had to rewatch the video to see what you were talking about. I never even noticed it when we filmed this. Lmao.
The black wire good in the conector for the fans too
@Farmerjohnson-offroad Thanks for all the info. I am in the middle of this swap on a 06 Chevy 2500hd. I have everything hooked up but only one fan comes on. The fans are new not salvaged and the wiring harness is just like what’s in the video. The ecu is flashed for e fans but only the drivers side fan comes on at temp. My ecu is blue wire in blue connector 42. Green wire green connector 33. Any help would be greatly appreciated
You have your wires backward. Swap them around and you’ll be good. You’re computer is ground the high side without ground the low side (which is “impossible” in a factory setting) which in turn only runs one fan on high.
@@iamlemarksman Thank you for the reply. After following all the info for install on my truck still coming up with the same results I swapped the wires and it works perfectly.
Glad you got it sorted out man. 👍
How’s the install video coming just got a set up today
We have done it on our 2000 6.0. Works perfectly. We figured out how to add in the control for the a/c as well. Installing it on an 01 8.1 this week. Video should be soon.
What do you mean when you say the 03 and above is plug and play?
Thanks for the detailed video! Doing the swap on my 04 with all Oem harnesses just like the one you show here. Should I install the red power wire on top of the post that receives power from the battery to the fuse box? its a 7mm bolt. Also one connector for the fan is a blue, the other one is yellow. I have the 5/7 blade setup which connector goes to which fan? dont want high and low to be backwards. Thanks for the help!
Yes, the red wire is a fusible link and it goes right to the 7mm bolt on top of the pdc. The connector with the yellow wire is the one for the drivers side. The blue/black is the passenger side fan. Hope this helps.
Farmerjohnson Off-Road Thank you very much! Found the info on a forum in regards to the location of the high/low connections and wow what a difference! no more cooling issues in 100f heat. Absolutely impossible for the crappy clutch fan to move the same air at idle. $130 for a junkyard setup and factory harness and $50 for a tune. Magical.
Where do I hook the power wire too
What color are the 2 wires for pcm on rhe factory harness?
Dark blue and green.
Hey, Farmer, I want to upgrade from my mechanical fan. I have an 04 silverado. Can you hook me up with the wiring harness?
So, I'm in the middle of this. Did I hear you right? Black wire from fan plug goes to relay, and ALSO to ground? Hoping for a fast reply, and Howdy from Nashville!
Yes, the black wire gets grounded. It grounds the fan motor and the #3 relay. Hope you got this sorted out.
I have a question my friend can those fans relays to hook up my air conditioning? Or I Have to do a separate relay for the air conditioning Compressor thank you!
You can tune the PCM to control the AC with what it already has. LT just posted a good video showing the tuning process.
Great detailed video thank you. Would you recommend this mod for a Tahoe that does some towing?
Yea. We have these fans on 2 2500 Yukon XLs, one with the 6.0 and the other an 8.1. Just towed 7k for 6 hours and never got hot.
I done a electric fan swap on my 2002 chevy silverado but now my ac is freezing up and idea on a fix
do you have a video where to ground and put switches...i got lost there ...on the 4 min video mark..or should i just leave it the way it is..lmk thanks
We ran the switches to the cab next to the headlight switch. One wire is for the low speed, both wires for high speed.
will they fit on a 94 gmc sierra
What color is the power beside the red one
If I wanted to get the e fans can I just straight wire it to a switch that I just flip on when I get in the truck I live in Florida so the fan will be on most days anyways
Yes. These require a ground input to turn the relays on. Before we got the pcm tuned, we ran 2 switches. Low speed and hi speed.
How much for a factory fan harness. I am having trouble finding one here in California.
where is this located
dont cut the "trigger wires". unplug the pins from the pcm so you can plug them into your pcm for easy factory look.
Yep. It was hot that day, so we didn’t feel like cutting the connectors apart to fish them out. But absolutely take the time to do this.
Wish I could see where the grounds are exactly. I'm troubleshooting non working cooling fans. You showed one and I appreciate that but the other one was obscured and you only pointed to a general location. I can't seem to find it.
Did you ever get this sorted? There is only one ground location on the 05-06 efan harness. It has two wires that go to it, one from the right fan and on from the relay box.
Would these e-fans work in my 2005 H2 Hummer 6.0L? It’s basically a revisited Silverado up front.
We haven’t had the chance to mess with a H2 yet. My guess would be yes, however, especially if the radiator and fan shroud are the same, then the efans would work too.
Can you do a video of installing the wires into the pcm? I don’t want to break shit opening up the plugs
We are planning on it. You need 2 wires for the pcm. One for the low speed and the other for the high speed.
Do you need to upgrade alternator when doing swapping to electric fans? I am planning on doing this in my 2004 Cadillac Escalade and currently have a 145amp alternator.
We have not had to in our setups. I believe we have 140 amp alts
@@farmerjohnsonoffroad sir please I need like this harness I need your contact number
Do you sell these harnesses already stripped and ready to install? Particularly the ECM/PCM pigtail.
Sometimes they pop up on ebay. Just DON'T buy the cheap Chinese copy of The Nelson performance harness i got one and the wires are thinn and the relay bases get hot
We don’t sell these, unfortunately.
So do I need to plug them into the pcm or can I just splice into the harness
You can run them to switches or you can run them to the pcm. But you need tuning software if you choose the latter.
also should i upgrade the alternator? my is a 99 gmc 105amps...
The highway factory amp alternator you can get is a 145. And I usually suggest you stick to a factory style. Most aftermarket ones that claim 300 amps are doing that at 5k rpms, with a belles factory rating for idle. I still have a 130 amp in my truck and it’s been 3 years and multiple Texas/California summers and haven’t had a problem.
By any chance would you happen to have any extra connectors with the blue and green wires with the pins already
No we don’t. We are looking to either partner with a company or start making harnesses. But right now we are just trying to put information out.
@@farmerjohnsonoffroad alright thanks for the advice so what would you recommend doing then I already have the radiator and e fans and I just did the harness but I was looking to use that connector with the pins but I don’t have it so what would you recommend I do?
@@juannunez7555 We will make a quick video explaining what we did before having access to tune them. I'll try to have it up tomorrow.
@@farmerjohnsonoffroad thanks man appreciate the help
@@juannunez7555 We uploaded a new video which hopefully explains what your looking for.
Where does that blue and green wire connect coming out by the fuse box
To the engine computer. We will have a video out soon to help with installing that.
Is it ok to have the e fan running whenever the truck turn on and whenever the truck is off the fans turns off heard a lot of people having trouble with ac so trying to avoid that 02 Tahoe
Running then constantly could be a bad thing. It causes more wear and tear on the fan motors and would be unnecessary in cooler climates. It is possible, but I would be unsure of how long your fan motors would work.
Running the fans continuously could lead to premature wear and possible failure of the fan motors. Could also bring poor performance as well. The problems with the efans is that the 99-02 need a little more work to get the pcm to control them with the AC. 03-06 are easier to do.
i have a question and watched all your videos about the e fan conversion i pulled the harness and fans out of a 05 suburban and installed them but trying to run them on toggle switches for now til i can find a dependable tuner shop but the question is what would cause the fans to only run on low with both switches on and never high? ive chased wires nothing wrong chased relays nothing wrong either nor fuses so im stumped hopefully you can shine some light on what maybe causing this issue and im installing these in a 2006 gmc sierra 2500hd 6.0L
Very well could be the high side of the motors are done. So if you ground both trigger wires at the same time, no high speed?
@@farmerjohnsonoffroad i apply power to both as a test to make sure they both work and they both run high like u shown on your videos but i ground both using toggle switches and they both run on low doesnt make sense all the wiring is ok so as the relays and fuses and motors are heathly and strong its just something is causing it to go both low when using the switches and the factory harness that was pulled
but yes when both switches activated both fans are on low and to void any confusion i replaced all the fuses and relays as a precaution after it didnt work the first try
@@TheHotrodder84 so the trigger wires are ground activated. And one of the relays is a 5 leg relay not a 4.
Having the wrong relay was an oversight I missed once.
So once i switch to the efans for my 03 1500 cateye do i have to tune it? Because i watch other videos and some say they send the ecm or pcm something like that to get it tuned for the efans switch
You do if you want the pcm to control the fans. If you don't then you lose the ability to cycle the fans with AC on and turn them off at certain speeds etc. You can get real simple and wire them to a temp switch to come on at a certain temp but be careful running your ac because you'll run super high pressures and it might actually blow out the safety vent on the compressor. I used ls droid and a obdx Bluetooth adapter to get my .bin file from my ecu and tunerpro to set up the fans the way I wanted them.
We used hptuners to do ours the 03-04 are way easier to tune that the 99-02. You can send the computer out, but some reputable shops near you might be able to flash your pcm for a little cheaper.
Hey bud, how can I test the harness before I put it in with the fans
Hmm. Not sure. They operate in series for low speed, and parallel for high speed. I have never seen a bad harness except for one. The one that was bad had a burned up relay box. Usually it’s the relays and fuses that are bad. Just cut the harness apart and make sure the wires are good.
when you change to the larger rad" so you need new hoses as well?
I am unsure if you need newer hoses. I actually hadn’t thought of that. The 28” vs the 34” might dictate you need the longer ones.
@@iamlemarksman Nope. same hose works for both. I got this done. I thought, but after install the fans are spinning backwards. I bought new fans, not used ones. I think they are defective... can't think of any other reason for this
@@bdtews hmmmm. What harness are you using? The black wire they we cut under the fans, that goes to the passenger side front frame horn, those get spliced together and grounded out. Basically it’s the same as the factory, but we move it to a more accessible position, usually the ground location on the engine block. No other wires need to be cut or spliced, unless they were done so before you got the harness. Splice the blacks together and ground them, and then the green and blue wires control the relays.
Can you do a video on how the relays are wired I can’t find a harness local to me an aftermarket is $100+ so I’m gonna build my own harness
We should be able to do that.
@@farmerjohnsonoffroad thank you. I got harness done an fans installed but they run an low all the time an never kick off
@@84yoder how do you have the two ground input wires controlled?
@@farmerjohnsonoffroad low speed is pinned into pin42 and high speed side I tried to hook to green ac clutch wire but when I ground it only one fan kicks on high an runs weather truck is running or not
@@84yoderso both wires need to be grounded at the same time to run both on high. The ac clutch is a power wire if I remember right, and you need a ground. The computer needs to be flashed to know to control the fans. We haven't gotten to that point so we just have two switches on the dash to control them.
Can I tune a 2002 tahoe for the fans to turn on at idle when a/c compressor engaged and turn off when running thanks
We messed with this a bit. Both of our trucks, 2000/6.0 and 2001/8.1, have the fans controlled with temps and with the a/c. My 2000 6.0 uses a pressure sensor the the 03+ uses. It reads the pressure in the a/c system to command the fans on and off. The 2001 8.1 however didn’t want to work that way. Instead, we have those set to come on whenever the a/c compressor is engaged. We believe it was a software issue and couldn’t find a way to make them come on with the pressures.
@@iamlemarksman I have a 2001 6.0 as well, what all did you have to do to get them to work with the a/c?
i have a 03 1500 hd 6.0 is that a 34 rad? And do i need to have my pcm programmed for the fans to work. Texas also Ft.Worth area
I am not sure on what called for the 34 in radiators vs the smaller 27 in radiators. Best course of action would be to measure your current radiator core, just the aluminum part, and see what you have. As far as programming, you will still need to add the pins into the computers connectors. However, for the 03-04, the programming should already be there to control the fans.
I want efans on my 97 k1500 any suggestions please
For the GMT400 platform, we have heard about using the 6.0 radiator and efans from a 05-06 gmc/chevy as well as using the upper tie-bar for ease of installation. However, we have not done any GMT400 efan swaps so we cannot confirm this.
can you tell me where the green & blue wires connect to the computer?
I’ll have to look it up. I believe it’s pin 33 of the green and pin 42 of the blue. If not, it’s reversed.
Green wire goes to blue connector pin #42. Blue wire goes to red connector #33.
How about using these fans/relays on a 98 K1500??
We know a guy in town that has a 6.0 radiator in his gmt400 with the efans and harness. He used the gmt800 top tie bar.
What part of Texas you in?
Central Texas next Ft Hood
Just did this I got 1 and the cover
Do you sell any of the harness you collect?
We don't sell these, unfortunately. We don't find too many of them ourselves.
We do not. Best option would be to keep an eye out at your local yards.
Will this work my a 5.3 ?
Yes. But, you need to have the larger 34” radiator, not the 27” radiator, for the fans to fit.
Have any harness for sale?
We don’t unfortunately
But you have to program pcm for them to work as intended.
Yes, you do. The 99-02 pcm has the ability to run them, you just need to do a little bit more wiring work.
@@iamlemarksmanhave an 02 suburban.what extra wiring is needed?? Thanks
what is the donar vehicle
This was off of a 2005 Silverado. Pretty much any 1/2 ton truck from 05-06 and Tahoe’s/Yukon’s and yukonxls / suburbans. The 07+ were integrated into the PDC, so they aren’t usable.
I did the install and pinned the ECU and nothing. what's next?
You need to have the ecm programmed
@@farmerjohnsonoffroad at the dealer? why wouldn't that be told on the video. you ended it like it was going to work once the ecm was pinned. Not hating, you just left a big part of it.
@@triplexj A dealer probably won’t tune it, you will need to have a performance shop do it. And this video was just explaining the removal process, wasn’t intended to be an install video. That will be coming soon.
@@farmerjohnsonoffroad 10 4
i want these in my 1994 gmc sierra 5,7 ext
Do you sell the harnesses stripped down for us lazy people that don't want to go pull them?
We don’t unfortunately
Would you be interested in pulling one and selling it? If so I would be interested
We don’t find these too often and haven’t been to any yards recently. Your best bet is to hit up your local yards and try to snag one.
@@farmerjohnsonoffroad thanks for the reply . I found one local
Absolutely and gas mileage increases alot,,remove the mechanical
So … you’re the guy cutting all the harnesses at pick n pull 🤔lol
No no, we don’t just hack them lol. It’s frustrating when people do.
😂
@@farmerjohnsonoffroad lol yeah I’m just playing but yeah. I was at pick n pull today , here in Texas , looking for the bolts for the electric fans. I just picked up some 7/5 fans , plus the harness from a guy today. I think I over paid though I paid $250 for the fans and the harness but it’s a complete harness. I was also looking for a center console to do a jump seat to console swap but no dice on that. Bad ass video though. I liked and subscribed 👍
Can u just make me one and mail it to me at whatever u would charge me?
We don’t make these unfortunately. But a little work in a junkyard could yield you a nice one.
Its really easy I just done mind in less than 10mins if you follow the directions he gives you
GMC switched to electric fans in 2006 so they didn’t keep mechanical fans which is older technology.
I would like to have a hot wife all the time not a cold wife 😂
I’ll give you $40 if you can help me do this at Wilberts
Thank u guys really appreciate all th knowledge I’m doin a 2000 Sierra An learned ur channel from LT’s channel thanks to u guys An him an now I’m more at easy on doin this conversion gladly appreciate u guys God Bless 🙏🏽🙏🏽🙏🏽🙏🏽
I have a 75 c30, I have a gen 4 6.0 and Chevy traverse fans, can I just change the plug on the traverse fans with the factory 6.0 harness?
I am not too familiar with those fans so I cannot give real answer to that unfortunately. Most gm dual fans are usually ran in series, being they have a low speed and high speed with a 3 relay set up. So it light be possible, but I’m not 100% sure.
Are the fans the same for the V6 as the V8 ?
Can I use this mod for my 07 silverado 2500hd classic 6.0? And will I have to control my fans manually off a switch?
Yes, but in the next few weeks we will do a video on the installing it into the PCM and tuning it.
Ok thanks, I'm in GA i don't think there's many tuning shops where I live so it will be hard