This was my experience with installing Dorman electric fans, a Denso 32" radiator, and an AC Delco 145 Amp alternator, with the BP Harnesses (relays, fuses, etc.), AC upgrade kit and BP tuning of my PCU. This was on a 2000 Silverado 1500, Z71, with a tow package, and the 5.3 engine with 148,000 miles. The truck also had a new/rebuilt transmission, a Scan gauge device and a new clutch fan installed last year. Much of these installation procedures I learned from KZread videos, but BP also sends very clear instructions. After the total installation and completing a key/security relearn procedure for the PCU/computer, my truck started but was running roughly. I then learned from my HAYNES manual that there is also a relearning process for your PCU when you disconnect and/or remove the battery. You'd think I'd have already known this. That process is to run the engine at idle until the temperature comes up toward the normal running temp, then run the engine at 1500 rpm for two minutes, then drive at least 5 miles under normal conditions. While running the engine at home I turned on the AC and the fans immediately came on at low speed, and they would intermittently, briefly cycle off and then back on. While making the relearn drive I drove down the HWY approximately 20 miles at 65 mph and up one steep incline, then back through some stops and starts. On my Scan gauge I could see that, as normal, my engine was running from 190 to 195 degrees. And my transmission was at 170 to 175. My truck temp gage stayed where it always does, unless under a heavy down-shifted load, at the first line before 210. As I wrote previously, I know that my fans come on at low speed as soon as I turn on the AC. And BP programs the fans to come on at low speed at an engine temp of 216 on, 209 off. And High speed at 225 on, 217 off. So, I turned my AC off intermittently to see if the engine temperature would go up and it never changed. It makes me wonder how much that clutch fan was spinning and using horsepower, even when it was unloaded, when it wasn't even needed. Or maybe the bigger radiator is the difference. Today I made my first run further, pulling my 21' toy hauler trailer on the HWY at 65 miles an hour up several grades/hills. One reason I upgraded all of this, besides the little bit of extra horsepower, was that before this, when I would pull my trailer over this same route, my transmission would down shift, my engine would go to 4000 rpm and if stayed at 4000 for more than a few minutes my engine and transmission temps would sometimes hit 120 to 125. And I did not like the sound of my engine in that state. Today neither my engine nor transmission went over 110. And my engine sounded so much better without the clutch fan. Even idling it sounds better. To be factual, today I was not as loaded down as I would be for a long camping trip and the outside temperature was only 70 degrees. But there was a very noticeable difference in the amount of downshifting and the temperature rise. Also, I checked my battery voltage when first starting the truck the first time, with the new alternator. It was reading 12.7V not running and 14.7V running, as it should. Today while pulling my trailer, I turned on its running lights and the AC to try and get as much amperage load as possible. At no time did my voltage gauge drop at all. But, since my engine never went over 110, with the AC on and fans at low speed, my fans would not have ever needed to come on at high speed. That means that I still don't know if there will be a voltage drop when I am pulling a heavier load and both fans go to high speed. A few more notes on things I learned. I didn't know that the old fan shroud bolts would not work for the new fan assembly so, I had to go to the dealership to get two more of the radiator bolts. The BP instructions tell you that you should change the O-ring on the AC Schrader valve that the pressure switch you'll install goes on. I also got that at the dealership. The instructions didn't mention that when installing the pins into the PCU you'll need something sharp and no larger than the size of the pin to punch a hole through the weather seal of the ports that did not already have a wire in them. I used a Phillips screwdriver about the size you'd use for glasses. One other difference from the instructions I ran into was that where the new relay assembly mounts, next to the relay/fuse box, I had an extra connector mounted under where the new assembly was supposed to go. So, I had to make an extension for the bracket where your supposed to mount the relays and I was able to mount them about 2 inches higher, over that extra connector. The case fit over this with no issues.

I received mine yesterday for my LS swap, well made quality stuff, very impressed at the application detail as well.

I just finished my conversion thanks to you for this video!

Money well spent best Efan harness you can get , had a eBay one shit melted in a month, really happy with this BP harness thanks 🙏🏻 for the video

Maaan I'm doing this mod along with longtubes and an intake and you just saved me tons of time. I was planning on gutting a harness from a tahoe that's equipped with these fans and reusing it. Not only does this save me the time love doing all that then putting a harness back together with the Heat Protector tubing and making everything look nice, but it takes out a ton of effort. This kid is so straightforward I'm glad you showed it on your Channel

@camwalt.4197

2 жыл бұрын

Also were you keeping ac? I see the ac update kit is required for elc. Fans with ac kept

Best explanation hands down thanks bro and definitely subscribed

Great video, appreciate you sharing this. I'm planning on doing my 02 silverado, but instead of using the computer, I'm planning on using a Dakota pac-2800bt controller.

Did this on my 00 GMC and 02 Tahoe, a year ago. Good quality harness and tech support, if you need it. The high pressure switch upgrade is a MUST IMO here in the So. Ca. desert. I used the fans out of 08 Escalades 6.0 for both trucks, and I upgraded the radiator in my GMC to the wider one, it was leaking anyway.

@phillipjohnson2244

2 жыл бұрын

Quick question. I did the exact modification as you, everything works as it should for high and low speed operations. However, I cannot figure out why the high speed fan will not engage at the ac psi threshold. Any thoughts?

Thanks for the video. Was just what I was looking to learn. I'm ordering BP!

Thanks for the detailed video. Exactly what I was looking for.

Great video thanks for sharing

I have the same harness. Bought it to replace my stock electric fan in my 05 z71. The harness is beautiful. The fuse block blew my mind. The way it was packed was crazy. In a box, inside another box filled with packing peanuts. Was extremely impressed

@petermichaellimacher8763

Жыл бұрын

Did you need fan tuning I have Efans from the factory aswell just got this harness and can’t get power at my fans

Super nice for sure

Thanks to you

Curious how this interacts with your ac. I dont think my ac has smart pressure sensors. So it would have to be on off based on ac switch not pressure.

So curious. I am looking at the BP harness as well... for my year they have the ac update kit. But yours works just fine and no mention of the ac kit? Comes with a pressure switch ect. Thanks.

Quick question, why did you connect a positive wire in the back of the alternator? Can you just have connected to the battery or that little red battery box?

So do you get the high function for both fans??

Damn you sound so handsome. Sweet harness.

Should the fans be on when you turn the key in the on position with out turning over,?

Very good video, by the way with HP runners are you running?

The settings for the fans how did it work for you?

Can I use 05 wiring to an 02 tahoe and will the tuning work if I use 05 settings

How did you get the pins all the way into the holders?

Both fans turn on when with the ignition on the on position before the engine turns over any idea why? Great video by the way

Hello question what if like most of us doing have a hp tuner to do this how much does it cost after doing the job and getting it program somewhere else because I see they will not work at all

Can you verify the blue and green wires going to the ECU? My tuner said the blue wire should go to pin 42 and green to pin 33?? Read some forums and saw another KZread video and they had the pins setup different than BP auto as well.

So I have a 2003 silverado 1500hd. I currently did the electric fan swap. I took the fans and the harness from an 2005. Once installed I got a buddy to tune, and enable fans. Wiring - small green wire pinned in blue 42. Small blue wire pinned in 33 green. Power and ground connected...... Well what I'm recognizing is that only the passenger side come on high once a/c pressure build up and in the middle of me driving. It's weird because I let the truck sit and run and idle to see when fans cut on at what temp. Temp gets to 200-210 and fan never cuts on. Only when I'm driving for a while and I come to I stop I hear the fan. So I don't know when they actually come on. Does both fans suppose to cut on at low speeds??? Are both fans suppose to cut on at high speeds ??? When I ground the green from the fuse box both fans come on low. When I ground the blue one passenger side comes on high

I wonder if this will work for my 5.3 GMC envoy Denali

I have one of the fans (pass side) turning on high while the other is totally off when one signal wire is activated and when I activate the other wire both fans turn on low speed. When I ground both signal wires out just the passenger side high speed fan comes on.... is this normal operation? Thanks

What version of hp are you using big dawg?

What thermostat do you have on your truck?

Does the wiring harness kit work with the 07-14 fans?

What fans are you running

So will that harness replace the fuse relay box in my 2006 gmc that is corroded to hell?

Where did you get your fans? GM factory?

I have the stock or oem harness and efans from a 06 sierra, Its okay if i do use that harness? I need help bro

What laptops work well for hp tuners?

We need a link for harness

Great vid. What is the programmer and scanner used and where to purchase items needed. Thanks

@XavierDaly06

3 жыл бұрын

HPTuners

Really like your setup, question. Do both fans come on low speed for low temp, then do both fans come on for high temp with this harness? Thanks, Great video

@buddyrebel_Garcia

Жыл бұрын

LOL. It is not about the harness. It is how it is tuned. LOL.

Anybody know what to do if my pin 33 already has a wire in it on the red connector?

@okcJG405

Ай бұрын

That's what I'm trying to figure out!

Hello nice video I’m doing a e fans on my 2000 Silverado swap I have a blue and red cover on my computer I no blue is pink 42 and the red is pink 33 but on my red there is already a green wire there so what do I do now please help

Does your fans come on when you turn on the A/c compressor? Because my don’t and my compressor starts ejecting the Freon through the restriction bypass, Before getting to operating temperature for the fans.

@gripnrip61

3 жыл бұрын

me too same harness... ever fix this problem?? @bp automotive

@jamesburgan4448

2 жыл бұрын

@@gripnrip61 i ordered one recently from them and they had an optional ac switch with a little plug havent installed it yet though. Did you ever figure yours out?

Well I guess I’m learning how to tune my truck 😅

Did your ac run?

How the 160 thermostat do does it keep it cooler ??

@XavierDaly06

3 жыл бұрын

Works great

Now do you have to flash the pcm even if the vehicle already has electric fans I just need to bypass my original relay block that corroded out

@XavierDaly06

Жыл бұрын

If your pcm is already setup for fans then no you won’t have to flash the pcm

Whats the part number for that harness ?

What obd2 tuner are you using? It doesn't look like HP Tuner.

@XavierDaly06

2 жыл бұрын

It’s hptuners

I watched your video over a year ago. Just wondering, how is it working so far? Are you very pleased with it? If you had to do these conversation all over again on a different truck would you do the same? Please let me know. Thanks, Great Video

@matt6951

Жыл бұрын

Works great.

So once i do this switch. I have to take it to the shop to get it tuned?

@buddyrebel_Garcia

Жыл бұрын

You can do the tune before. I am in the process of getting this conversion done on my Hummer H2 and I had the tuner tune my ecu. He set the temps as follows: high speed fan at 212/209 low fan 205/198.

Quick question do I use pin 33 on green as well? I know yours was red?

@johnphillipsjr7238

2 жыл бұрын

Yes

@clinicaautomotriz7129

11 ай бұрын

@@johnphillipsjr7238

@clinicaautomotriz7129

11 ай бұрын

WHY NOT IS ILUSTRED THIS STEP IN RED CONNECTOR IS ONLY CUESTION

You didn't put a link for the wiring harness

How did you activate your ECU to work with the e-fans?

@XavierDaly06

Жыл бұрын

Hptuners

Will fans for 07 silverado work on a 01 silverado

@buddyrebel_Garcia

Жыл бұрын

They should but you might have the smaller Radiator. You would have to buy a 34 inch radiator.

How does a normal guy like me get the computer software to turn on the fans and set the temps?

@davidcastillo379

Жыл бұрын

I want to know too

Followed your setup exactly. Works great but after getting to temp a relay won’t stop clicking. Customer service states it’s an issue with my calibration. I have HP tuners and did same thing you did. Any suggestions? Thanks.

@eddieobrien3107

2 жыл бұрын

Zach, I'm having the same issue, did you resolve it?

@jamesburgan4448

10 ай бұрын

I'm having the exact same issue

Anyone know what belt to use? I bought the bigger 145 amp alternator and read I would need a longer belt.

@ebottop6785

2 жыл бұрын

i have a 370 that has a smaller pulley. works fine with stock belt. could use maybe less than an inch shorter but no issues 3 months later

@buddyrebel_Garcia

Жыл бұрын

If it is the same design as your old but higher amp, why would you need a new belt? They are stupid. Unless you got a different alternator from a different vehicle.

@lulop022882

Жыл бұрын

@@buddyrebel_Garcia Higher amp alternator is actually overall bigger. 2 part numbers are usually listed one for each alternator. I did the conversion and did use the part number for the 145 amp alternator, belt fit like it should.

How much u charge to turn my fan on I’m in the Dallas area I have a 01 Silverado?

@XavierDaly06

3 жыл бұрын

Email me at aaronleedaly@yahoo.com

I have a 2001 GMC Sierra I like to install a electric fans basically I like the set up you install but I don’t have a scanner to adjust the temperature for fans my question is can still work with out scanner adjust the fans ?

@dalebourgeois9851

2 жыл бұрын

You dont need a scanner, if you bought the bp harness with the blue and green trigger wire, you can get the Dakota Digital pac-2750, or Dakota digital pac-2800bt module and set it up

Where did you get the harness?

@XavierDaly06

11 ай бұрын

Straight from there website

Do you have the link for that harness

@XavierDaly06

2 жыл бұрын

bp-automotive.com/product/1999-2006-gm-trucksuv-fan-harness/

What fans did you use ?

@erickrodriguez7371

2 жыл бұрын

I’m assuming oem ???

@gerardolopez5875

Жыл бұрын

05-09 silverado , tahoes, subs, fitts all, Get the stock 05+ relay kit, its very cheap at junk yards , this kit this guy used it could be like 120$, And the stock kit its like 25 at junk, or someone parting a truck

Can you still do this without hp tuners??

@tysoncurrie7745

2 жыл бұрын

From what I understand is not a lot of other programs out there allow you to mess with the fans but HP tuners and a GM tech 2 tool that dealers used on GM vehicles. You can also find a tuner in your area to see if they will do it for you, some of them have HP tuners for tuning GM vehicles or see if the dealership will turn the fan function on for you with the original temp settings set correctly but it all depends on what they charge and if it would be worth just buying HP tuners to do it yourself for around 350 bucks so youcan change anything at anytime you want. You can also try to find a original tech 2 for sell they are close to 1000+ buck or more, it's crazy 🤪. I myself am in the process of doing this mode, I have the fans and bought the OEM harness that came from a GM truck that had the e-fans on them and now looking for a tuner myself to see the pricing and depending on the pricing will either have the tuners do it or buy the HP tuners and do it myself. Hope somewhere in here I answer your question.

@tysoncurrie7745

2 жыл бұрын

Not to forget without using a tune, you can run the green wire to a switch and the blue wire to a switch, both switched to ground to turn them on or off manually, one switch on is low, both switches on is high. Or buy a fan controller from like flex-a-lite fans and run them that way without tuning but the OEM way is the best way to go.

How can I get in contact with you

Where is your shop located

@XavierDaly06

3 жыл бұрын

Dallas area

Where is the link for this harness

@MarkBSmolen

3 жыл бұрын

👍

@adamthemechanic8054

3 жыл бұрын

What HP tuner program does this call for

Why not just go to a truck that already has electric cooling fans the fan harness is a separate harness that's a plug in and with its own relays and everything hooks right into the factory fuse box i bought my complete set up out of a 05 Silverado with a 5.3 from my local salvage yard for 75 bucks and that was with the fans included

@XavierDaly06

2 жыл бұрын

If I could have found one locally I would have. But also for the price I don’t have to deal with 15-20 year old wiring and relays.

Can i buy the wiring harness online?

@XavierDaly06

3 жыл бұрын

Yes BPAutomotive.com

@XavierDaly06

3 жыл бұрын

www.bp-automotive.com/product/1999-2006-gm-trucksuv-fan-harness/

@samuelcano4578

3 жыл бұрын

Thanks!!!

@nicolassanchez5439

3 жыл бұрын

Are you in the Dallas area ?

@XavierDaly06

3 жыл бұрын

@@nicolassanchez5439 yes

Poquito

WHAT FANS ARE THEY and stock radi. correct ??? ALSO EVERYONG harness = 150 + 50 tune + fans

@joerivas9847

2 жыл бұрын

I used fans from a 6.0 2008 Escalade on my 02 Tahoe.