How to install E-fans on your 1999-2004 Silverado/Sierra/Tahoe/Yukon/Suburban, etc

[@bluecollarhotrods9781]

I see people here in the comments saying they have AC issues. If you have a 99-02, they are wired differently and the functions in the PCM are slightly different. I am chasing this issue with my 2001 Silverado and the PCM of NC harness/relays. The answer to our problems is a different pressure switch and a few wires that get pinned to the PCM from BP Automotive. It's a $75 kit, i just ordered one. I plan to do a video outlining my issues, and what fixed it. Hope that information helps someone.

[@nufnuffz28]

You are correct. I will find the settings we have used there and post them in a separate video

[@bluecollarhotrods9781]

@@nufnuffz28 Thanks! Definitely appreciate that.

[@jimmyramirez8844]

I did mine and now my ac compressor will not turn on everything is brand new if I remember correctly on my 01 gmc I had to remove a wire for ac will this fix that issue I know the pin lay was diffrent

[@erikg6905]

Did you make video

[@bluecollarhotrods9781]

@@erikg6905 I did when I finished the install on my 2001. kzbin.info/www/bejne/hZfMlIiBiaZ9fassi=0whVo90ymFun5S-j

[@juliobahamundi7062]

I bought a K&N filter from a wrecked '05 Sierra to use on my '02 Yukón but... Sierra use electric fans and mine are clutch. Same engine. I hope this video will help.

[@orlandogarcia8435]

I did the efan on a 04 sierra with oem harness took to a shop to get installed. The only problem the high fan stays on all the time till truck is turned off . Is that something normal ? And only one fan stays on .

[@gerardolopez5875]

Wrong!!

[@mesmaayan]

Got a 99 Silverado Z71 that I’m trying to do the conversion on. How much for the ecu tune and where do I send it to?

[@nufnuffz28]

Email me [e-mail]

[@bryonaderhold2009]

I did this conversion I didn't hook it up to the computer. So my fans run all the time tell I turn my truck off

[@txsrigo6495]

How?

[@bryonaderhold2009]

@@txsrigo6495 I actually paid backyard mechanic to hook this up. There's wires underneath the steering wheel

[@bryonaderhold2009]

I did buy all the parts though. I used the 2006 Chevy Silverado fan system and it went just like factory.

[@bryonaderhold2009]

​@@txsrigo6495I also had to do the big 3 upgrade because with the fans always running. It was draining my battery and alternator. After a year. It runs perfect now I went with an 1500 amp alternator.

[@alexayala6720]

Does the fan just run off 12volts so hook it somewhere?

[@budthechud3408]

If you wanted this to be stand alone and not ecm controlled what changes need to be made?

[@nufnuffz28]

None. It could be put on switches or twmp sensors placed in the radiator or head

[@miguelacosta8825]

i got a question???? does anything’s fuck up if you take the cumputer off and tune it without the truck?? the truck alr has a tune it just needs the efans programmed now

[@nufnuffz28]

No. You can mail us the ecm and we can tune it

[@EMan-yy3db]

Hi, Question. I have a 2004 Chevy suburban 1500 LT RWD and I want to upgrade/install E-Fan(s) mostly because I experienced a common issue with clutch fan not cooling the AC system in a consistent manner. Thought I had an AC issue, but recently learned it is what you get with a clutch fan. I'm also interested in improved overall efficiency of my SUV. Can you (or anyone) tell me what e-fan(s) I can/should use? I don't need total perfection, but I do need them to work reliably, even if that means using unorthodox install methods. I know how to remove and install, I just need to be sure I'm buying the correct things. I also have access to/live near many auto dismantlers/pick-a-part businesses to look for parts I need. *SoCal high desert dweller: summer time temp is 105 F daily for months- I think E-Fans will help me. Recommendations? Thanks👍🏽

[@nufnuffz28]

Measure your radiator. If the amaller one 98-02 f body fans. If the larger one the 05 up fans. IMO skip the small ones and go to the larger later radiator and truck fans. I need to do that as well

[@ramkarranpersaud965]

Hello how are you? I did an la swap and I have two electric fan ,I was wandering if the ECM put out ground or power on the coil side of the relay to turn the fan on?

[@miltonmiranda9900]

Will this harness work with 2000 gmc 4.3?

[@willey224]

What name brand is the dual fan kit you purchased in this video?

[@nufnuffz28]

Amazon f body fans

[@ahib5994]

Thank you Mr here here here and here!

[@shannonallison4202]

i just did the swap and did everything you did. I got my ECU tuned before installing so the fans would already be ready to work like factory. After finishing, my check engine light is on and the truck is running like it did before i got it tuned. Any suggestions or help.

[@nufnuffz28]

Would need to see the tune

[@RICKY-LSX]

Have a 03 yukon would I have to upgrade the alternator for more voltage or is the stock one good

[@nufnuffz28]

It helps, but not necessary

[@joaquinmeza8251]

Where can i look to upgrade the computer for my truck, a 2004 Chevy silverado? Where did you buy that system, send a link if you can? Or i can send it to you so you can fix it.

[@nufnuffz28]

We can most likely repair it or update it? Email [e-mail]

[@jakemustian99]

If i take my 2002 yukon to a mechanic to do this, what should i expect to be charged ?

[@nufnuffz28]

Imo 500-700

[@user-zt4oj9ip3o]

How much gas does it save or how much more MPG gain

[@JesusArzate-nv9io]

There is a red and white wire connected to one light blue wire we’re do that one goes to?

[@kevinvaldivia4303]

Question i just did my swap to efans wht gauge wire do u recommend or is recommend to run for harness & relay connectors ...the ones i used where running good but other day happened to burn the connector ....

[@nufnuffz28]

Get the good harness from PCM of NC

[@rayrodrriguez2234]

@nufnuffz28 what fan set up did you use on the truck? If you dont mind me asking , i been trying to do the same with my 2000

[@nufnuffz28]

Ls1 car fans and a custom bracket

[@mcmobski1657]

Question! I have efans already installed but whoever had it didn’t wire it right. If I re wire it, do I have to retune or not ?

[@nufnuffz28]

If tuned correctly they should start working once the wiring is fixed

[@harrisonjbo6058]

Did you use the stock alternator ?

[@nufnuffz28]

Yes. If you ever replace it go to the 150 imo. Just need a slightly longer belt

[@exoticpapo5362]

Can I do multiple trucks with HP tuner?

[@nufnuffz28]

If you buy unlimited gen 3, yes.

[@jshddm2009]

i did the swap but now my ac keeps freezing up any idea how to fix it

[@nufnuffz28]

Compare fan settings (and AC settings) to the original tune from that year. Your compressor is running non stop...

[@nathanielparedes7283]

Same here . Do you fix it ?

[@ren3gade__]

Link to dual fan assembly

[@nufnuffz28]

Amazon

[@budthechud3408]

Part number for the Michigan motorsport wiring harness?

[@nufnuffz28]

Not sure. It was found on Amazon

[@lauroguerra732]

any idea why relay on the 87 pin would melt the little block where it inserts into. Could it have been the vibration and engine heat? Because I don’t have the relays mounted anywhere I left them loose.

[@nufnuffz28]

Not sure!

[@BuddyHart-tj2yi]

Did you ever figure out why 87 pin melted the little block where it inserts into? I had the same issue with factory harness melting 87 pin on all 3 fan relay insert blocks and not sure why or how to fix.

[@lauroguerra732]

@@BuddyHart-tj2yi I just swapped out the e fan harness out with another new one from Nelson performance 0 issues ever since!

[@escobarmorales8060]

What type fans are those ?

[@nufnuffz28]

4th gen f body fans

[@mattn5804]

Did this swap to my 01, only the passenger fan comes on high when the ac is on not both low like u got. Should they both be on high when the ac is on? Driver side comes on low with engine up to temp

[@gerardolopez5875]

If wired correctly, both fans low, both fans hi! And a/c on both hi,

[@fernandoanchondo387]

Test your fans independently, one might have burned out.

[@OfficialCaptinn]

Do you have to tune it to do this conversion?

[@nufnuffz28]

Yes

[@keithmitchko1386]

So I did this conversion and did the relay to the ac switch and that works. Why would my fans be running as soon as the engine is running tho and not up to temp? Also doing the relay will cause them to run during winter correct?

[@nufnuffz28]

Gotta be tune or wiring. Not sure without looking at it!

[@keithmitchko1386]

I think I figured out what he programmed wrong and that ac hasn't been switched to fan 2. Thanks for the reply.

[@theblazingrevolver4719]

​@@keithmitchko1386you need to upgrade the OS to 12212156

[@kcroc44]

Did you ground them to the side of the alternator bracket?

[@nufnuffz28]

There or the frame at the bottom usually

[@Superspeeeed]

It’s not plug n play I have to get tune or no?

[@nufnuffz28]

Yes. You'll need a tune

[@jonasdelagarza2150]

Can I have it tuned before I install e fans?

[@nufnuffz28]

Yes.

[@Teeon2wheelz]

I have access to an 05 parts truck could I just take the pcm from it to avoid having to tune?

[@nufnuffz28]

It would still need to be tuned for your vin, cats, injectors, etc

[@nufnuffz28]

Get hptuners or borrow a friend's and we can help

[@Banana-handyman88]

How much your charge for the swap?

[@nufnuffz28]

Around $600-700 tuned for fans

[@enriquesanchez7747]

@@nufnuffz28600-700 for just the tuning ?

[@midlman71]

I had my suburban tuned but the ac still not kicking on the fans when the engine temp is below 200 degrees what are the ac pressure setting supposed to be?

[@nufnuffz28]

Depending on the year, it may need to be tied into the ac compressor wire. Or tune or wiring. Hard to say without looking

[@midlman71]

@@nufnuffz28 it's a 2004 suburban

[@nufnuffz28]

@@midlman71 ok. It ties into the PCM that year

[@harryfp1494]

Did you switch your thermostat to a 160 degree ?

[@midlman71]

@@harryfp1494 it's set at 196 degrees

[@kcroc44]

What’s the pricing on hptuners for this project

[@nufnuffz28]

Hptuners sells the package with 2 credits around $500. Then you have to tune it

[@IndiansAuto]

Is you AC on high speed?

[@nufnuffz28]

Yes

[@jonesininktattoos5243]

Hey bro got a 2000 tahoe I've been doing alot too this is one doing in next couple days after i pull the fan harness in the morning off the 06 i got off friend after wife got hit, question is, if i just swap the 00' ecm with a 06' ecm will everything work properly still with rest of car an motor with the 2000 harness with pinning the two wires in sure the fans would work, but making sure i wouldnt have to update the climate controls and stuff to the 06 stuff cause I know they changed the plugs that connect to the climate control and the light switches anf stuff (my light control went out grabbed one from a 04 how found that out original) 2nd question would be if it all would work still if i updated the plugs and added any other wiring the 00 harness doesnt have for it would the updated 04-06 climate control units work with the 99-03 dash hardware properly (figuring the duel climate wouldnt without the duel baffles and fans for the vents) but would it still swap threw floor to defrost and hot to cold tho? Cause I also know from 99 to 06 the 5.3l tune got updated also and the HP went up twice dont wana swap it and the differnt tune possibly mess up the 00' 5.3 motor with a 06' 5.3 tune or would it actully run better like the 06 then and make that extra 20-30 hp they gained in that time? I do have the 06 motor also cause the 06 i got off friend wife got hit totaled it but only had 121k on it so got it as a donor to swap out the 00 288k in mine just going to be a few weeks before i got time to swap the 06 motor in cause if it would ill just wait on the e fan tell i do motor swap and work on preparing bumbers and stuff im getting color matched instead tomorrow lol. Sorry for thw novel😅

[@jonesininktattoos5243]

I'd love for the duel climate and stuff to work also but swapping all the components behind dashes isn't worth having it lol unless its all stuff you can reach without taking most the dash out from the bottom.

[@buddyrebel_Garcia]

I have a question. I haven’t done the conversion yet I’m waiting for the parts but I want to get the tune done before I start the conversion. can I have the tuner tune it before the conversion or do you recommend them tuning it when it’s already installed? The reason I’m asking is because I need to drive the truck this week and I need it tuned so when I’m ready to do the conversion I don’t have to worry about the tune since it’ll already be there will there be a problem if I do the tune before? In other words will it be safe to do the tune with the clutch fan still in there??

[@nufnuffz28]

Yes, thst is perfectly fine

[@acetone21]

Is $250 allot to get it tuned?

[@nufnuffz28]

Cheap.... if done properly

[@acetone21]

@@nufnuffz28 they set them up to turn on medium speed at 180 and 190 for the fast speed was that a good temperature to turn on?

[@nufnuffz28]

@@acetone21 thats a little cool., but glad they are working!

[@andyolson6781]

dont you have 2 ground wires??

[@nufnuffz28]

Some kits do. Some tie them into 1 larger wire...

[@Boostededdy]

When you say crank it for 1-3 min, do you mean literally cranking the truck that long? I’m confused by that

[@nufnuffz28]

Let it run a few minutes

[@twitter_god_sunny7900]

Does it matter which wire goes into 33 and 42 because I’ve seen videos say different from another

[@nufnuffz28]

We always do it this way without issue, so the only way we do it...

[@2Mont106]

@@nufnuffz28 I pulled the green out of 42 and the blue out of 33 and this came out of a 06 chevy tahoe

[@nufnuffz28]

@@2Mont106 I'm not sure then. I know the ECM triggers the two fans based off of different criteria through those PINs. You could probably also search for PCM for less's instructions as they have a detailed write up sheet. Thank you

[@2Mont106]

@@nufnuffz28 Idk why this is so but I took the "Wiring Harness/E-Fan" off of a 2006 chevy tahoe to place on a 2003 Z71 chevy tahoe. However, not wanting to over think 🤔 this process I'm now wondering if in any way the ECM wiring might differ depending on the year? 🤷🏽‍♂️

[@nufnuffz28]

@@2Mont106 they have all been the same we have done. In the older ones there is a wire yoh pull out that it replaces...

[@edgargzzg4495]

I did the same and when I turn my a/c on, the fans won’t come on until it reaches the temperature, somehow it’s not sending the signal from a/c to turn the fans on, any ideas??

[@nufnuffz28]

What year truck?

[@nufnuffz28]

@@trentyoung2105 look at pcm4less website. It shows the difference in the earlier years

[@edgargzzg4495]

2004 4.8

[@iantrevormorris]

Does your ac work

[@nufnuffz28]

Yes. Very well

[@IndiansAuto]

Is it connected to the high fans?

[@JoseGonzalez-lm8hq]

How much it cost a complete e fan swap?

[@nufnuffz28]

Parts woth a good harness and new fans are available on pcm4less. We get fans from amazon usually

[@memolc1989]

Hi there , on pin 33 were green wire goes to there is already a green wire there for something also. What should I do there?

[@nufnuffz28]

@blazing high performance

[@ivanf.5253]

I have the same issue

[@erickcoria941]

Did you figure this out?

[@theblazingrevolver4719]

Just remove the existing wire (recirculation mode) and put the new one

[@fernandoanchondo387]

Does this work if your harness connector is red.​@@theblazingrevolver4719

[@swain1022ify]

Are you in Mi? Can you do my truck ? Same one ? Lmk Jason Carriveau hit me up . Thanks

[@nufnuffz28]

Nc here. You can mail me the pcm

[@Tw2dollar]

Where did u get it at?

[@nufnuffz28]

Fans amazon. Wiring hit up pcm4less

[@joevaz9293]

Hello what's the benefit of the swap?

[@nufnuffz28]

More power!

[@fernandoanchondo387]

Not only is it more power , but your air conditioning won't overheat your vehicle as fast. My 2002 Avalanche overheated in the drive through on a 115° day. E-fans would have let me run it longer.

[@BIGREEN5K]

Where did you get the fans from?

[@nufnuffz28]

Amazon

[@bennettbritton4029]

@@nufnuffz28 what’s the part number for them?

[@nufnuffz28]

@@bennettbritton4029 not sure. Just looked through Amazon

[@daltonbrunson2767]

how for you to tune my computer

[@nufnuffz28]

Email me [e-mail]

[@gerardolopez5875]

Both low , and 1 on hi! Its not correct!

[@dilinplayz4249]

Pro tip, when recording you have to pretend like our eyes are your camera.. when you zoom way into shit I about threw up haha take that clip you were showing and put it about 1 inches crom your eyeball and you'll see what I'm talking about

[@nufnuffz28]

Thanks

[@edgaracevedo2427]

Bros i really want 2 do this to my truck the only thing that i can not do or dont know who can help is the computer tuned dont know where to take it is there another way? Thank u

[@nufnuffz28]

Just ship it to me

[@edgaracevedo2427]

​@nufnuffz28 ok how much for the service also paypal or i can send a check with the package

[@nufnuffz28]

@@edgaracevedo2427 yeah. Email me [e-mail]

[@Dannymexx]

Does we have to change the radiators ? I have a 28” oem

[@nufnuffz28]

You can get fans for both (LS1 for the smaller one and 05 up truck fans for the larger one)