How to install E-Fans

[TWITCH101]

Been emailing blackbear about getting my pcm flashed and not a return email yet....anyone know whats up?

 

[CHOO CHOO]

Dont email them anymore. Their email system is wierd and goes in order of recieved. If you send another one, it bumps you down to the bottom of the list. Try pm'ing them on here, might be quicker.

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[TWITCH101]

they got back to me today. looking forward to this mod. Anyone care to post up their mpg differences from before and after the fans??? I'm very curious to see what happens to my fuel economy.

 

[JennaBear]

Yes, multiple emails are what can extend our response time to customers.

 

[01HDtahoeNJN]

What size belt is needed with the black bear overdrive pulley!?!?

Also Justin says he includes the codes to have the efans work when tuning vehicles now does this mean my PCM is flashed!?

 

[bottomline2000]

I used the stock belt with the od pulley. Yes, ur pcm is flashed.

I gained 1-2 mpg with the tune. What was more noticeable was the power. I hated driving my truck in the summer with the a.c. on. Complete slug. Once Justin removed the torque management it felt like a new truck. I get 14+mpg city driving like I want compcared to driving like granny before and getting 12. Getting rid of that mechanical fan helps big time.

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[beav626]

Awesome- Im going to use this soon

 

[mikewayne]

As said its really a nice and a very helpful post, in language easy for even a novice and is really very helpful due to the images and easy to go with language and almost all details covered that may lead to problems later, and has really helped me to work out on my wheels rather easily.

 

[TWITCH101]

So I got everything I needed and started today. My blue pin #42 worked perfectly but I'm at a bit of a standstill so someone please help me. My pcm does not have the blue and green covered connectors. Mine has the blue and Red!!!! Also, on the red connector the #33 pin is taken. Could someone help me out? my harness came with the green #33 pin connector and I'm confused if I need to tap this one into that same pin or at another spot.

---------- Post added at 10:57 PM ---------- Previous post was at 08:58 PM ----------

So i think blackbear sent me the wrong harness and the wrong tune for my pcm....I hooked everything up the way it should and when i tried to start my yukon it would not run. The starter would turn the engine but it would not run.

So I took it back to stock with the original pcm and it started right up. So I'm suspecting the PCM is my main issue right now.

 

[bottomline2000]

If you have an 01 truck you have the wRong harness. Pin 33 should be an a.c. tap wire for you on the harness next to the alternAtor.

If they sent you a new tuned pcm you need to do a crank relearn for your truck to start.

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[Rivieraracing]

You need to do the security relearn, that's why it won't start for you!! Gotta turn the truck on to the on position for a set amount of time and do that for a few times, contact Jenna on here and she will let you know exactly how to do that if you PCM didn't come with any directions!! After that, your truck will throw an engine code light until you get the crank relearn done but it will run and drive while needing that!
Also yes, if you have an 01 or 02, you should only have the 1 pin BB harness to hook up your fans!

 

[JennaBear]

As stated, you need to perform the security relearn. The instructions are on the paper that came with the PCM.

Definitely sounds like you have the wrong harness. Shoot us an email and we will look into it.

Sent from an ice cream sammich.

 

[TWITCH101]

My dad opened the pcmcia before I ever saw it and said there was no paperwork...I think he may have lost it or didn't see it. Is there a way to make the later model harness funtion the same as the early models without a ton of rewiring? If so then I might go that route.

---------- Post added at 01:58 PM ---------- Previous post was at 01:56 PM ----------

Jennabear...I sent an email last night. Waiting for reply. And I guess I clicked on the wrong harness when I bought it because my paypal says 05+ harness so I guess that's my fault

 

[HK-DEMON-]

I need some information regarding the removal of the fan assembly.

So let me get this clear, once the fan assembly has been removed do you need some type of nut or bolt to replace where the fan assembly once was? To me it seems that what kept the pulley from coming off was the fan clutch assembly, since the fan assembly has been removed will that pulley come off? I hope I made myself clear and explained this correctly?

 

[bottomline2000]

I need some information regarding the removal of the fan assembly.

So let me get this clear, once the fan assembly has been removed do you need some type of nut or bolt to replace where the fan assembly once was? To me it seems that what kept the pulley from coming off was the fan clutch assembly, since the fan assembly has been removed will that pulley come off? I hope I made myself clear and explained this correctly?

No need to put a bolt on the pulley. It is part of the water pump assembly. Its all one piece so just take the fan off.


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[HK-DEMON-]

No need to put a bolt on the pulley. It is part of the water pump assembly. Its all one piece so just take the fan off.


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Thanks for the reply.

 

[TWITCH101]

Ok so I talked to Justin @ blackbear via email and he suggested I use the 05+ wiring harness and just have my pcm flashed to take the dual pins. My question is that I already have a pin inserted into the red #33 slot on my pcm so how is this going to work since I have an 01 and not an 03. I'm not sure as to what is already in that slot....Is it the control for the fans? Is it the control for the A/C compressor? I'm kinda lost as to how that will be accomplished. Could someone explain?

 

[chrisreed822]

Go to this link and see how he did it. He has a factory harness but you can set yours up basically the same way.


http://www.tahoeyukonforum.com/forum/showthread.php?t=28336

 

[TWITCH101]

I read that thread but I still don't understand how a second pin on my harness will work? My PCM has blue and red connectors instead of blue and green.....and on my red connector pin #33 is already taken. So where does that wire go? Do I tap into the A/C clutch wire like the 01 harness or is there another way?

---------- Post added at 07:03 PM ---------- Previous post was at 07:02 PM ----------

Also....I could use the security re-learn procedure if someone knows it. Gonna tray and figure this out one day soon.

 

[bottomline2000]

I read that thread but I still don't understand how a second pin on my harness will work? My PCM has blue and red connectors instead of blue and green.....and on my red connector pin #33 is already taken. So where does that wire go? Do I tap into the A/C clutch wire like the 01 harness or is there another way?

---------- Post added at 07:03 PM ---------- Previous post was at 07:02 PM ----------

Also....I could use the security re-learn procedure if someone knows it. Gonna tray and figure this out one day soon.

As stated before you have the wrong harness. Pin 33 doesn't work for you. Stop looking at pin 33 lol.

For the 03+ it measures a c pressure or some crap to activate the fans. We older trucks pick the signal from the a.c. compressor turning on hence the need for what should be a wire tap on your harness instead of a pin connection. So when my compressor turns on one fan activates on hhigh.

Like I said the 03+ trucks have better fan control but our setup does the job.

No idea if you can modify your harness or not.

The security relearn process is on here somewhere. A scan tool should be able to get rid of check engine light code that follows.

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