How to install E-Fans

[JennaBear]

Rather than crossing lines, make sure you follow what Justin has discussed with you via email. You purchased the wrong harness, but we are having you do a work around.

In short, the PCM you are going to use, needs to be sent in to be set up for PIN 33.

 

[TWITCH101]

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.

Thanks for the help....I'm still working with Blackbear at the moment. If they think I can get a better setup and not have to hassle with an additional harness then I might go that route but I'm just so confused at the moment. I understand what I need to do as far as I could take the easy way out and just get the correct harness and be done with it. But I think Blackbear has another idea for me.

Rather than crossing lines, make sure you follow what Justin has discussed with you via email. You purchased the wrong harness, but we are having you do a work around.

In short, the PCM you are going to use, needs to be sent in to be set up for PIN 33.

Your last sentence is the one that confuses me the most.

There is already a pin in my #33 slot on my PCM. So how will I manage to fit another PIN into that slot?
If Justin reprograms my PCM for that slot(#33) as a fan control then what function do I lose?

What does the #33 pin control from the factory?

 

[JennaBear]

Ignore my last post, as I don't want to confuse the situation. Don't worry though, Justin will get you all figured out.

 

[TWITCH101]

Will do. I hope we are all on the same page is my only real concern.

Could my yukon having autoride be a reason that pin #33 is currently in use?

 

[JennaBear]

No, that PIN does not have any bearing for you. It all has to do with the programming. Justin can take care of it.

 

[TWITCH101]

Ok. I'll trust him.lol

 

[01HDtahoeNJN]

Gonna buy the bb harness for my 2001 lt which one should I get the 2005 one w overdrive or the ls1 w/ overdrive!?

 

[1Agerry]

awesome info,thanks man!

 

[TWITCH101]

Gonna buy the bb harness for my 2001 lt which one should I get the 2005 one w overdrive or the ls1 w/ overdrive!?

I bought the 05 with the overdrive pulley. I Am currently waiting on my PCM to be programmed and mailed back to me. If you can wait a week I can let you know how mine works.

BB is re-working my PCM to accomodate the pin#33 so that I don't have to tap into another wire and now both fans will be controlled by pcm. I would say go the same route as me but I would suggest waiting and seeing how mine works out. Then make your decision.

 

[beav626]

Hey guys- I traded my 03 for an 09. So I have the E-Fans out of my 03 (06 Denali) and Nelson Harness that I am selling- If anyone is needing one or knows of someone send me a message.

Thanks

 

[04blackout]

Hey guys- I traded my 03 for an 09. So I have the E-Fans out of my 03 (06 Denali) and Nelson Harness that I am selling- If anyone is needing one or knows of someone send me a message.

Thanks

do u still have these? im looking to do this pretty soon

 

[beav626]

do u still have these? im looking to do this pretty soon

No-it sold

 

[04blackout]

I can't find an answer anywhere, so maybe someone here can help... I hooked my fans up with my new bbp pcm, and they didn't turn on. Its my understanding that the pass side should come on with the a/c, so I cranked it on high but nothing. I know the drivers side wont kick on bc its colder here but is it possible that the pass side isn't on for the same reason? I thought it would kick on no matter what the ougside temp with the ac on. If it wont run til the temp warms up, how do I know they're functioning until then? I don't wanna risk overheating my engine if it does get warm outside

 

[beav626]

Check with BB and he should explain the on off sequence

My passenger side came on when truck started and drivers side at desired temp then on high for desired temp

 

[bottomline2000]

If you have an 03 or newer your passenger fan works off ac pressure I believe so it doesn't cycle on and off with ac compressor like the older model trucks. May have to let it run and build up pressure.

As far as the temperature test for both fans I would drive it around until it gets to operating temp and stop and let it idle. Fans should come on before temp needle reaches 210.

Our radiators are fairly efficient so just driving around my fans hardly ever turn on.

Sent from my marble slab!

 

[04blackout]

Ok thanks for that, I guess I misunderstood exactly how they work. Ill make up some long connections so I can test them without actually mounting them in the truck. I don't wanna have to put them in and take them out again lol

 

[04blackout]

i feel like a big ole **** now, but i got it all working... bottomline2000 hit the nail on the head, i just didnt give it enough time to fully warm up. to test them, i made 4 temp jumpers with spade connections on either end and placed the fans on a work bench, removed the clutch fan and let the truck warm up, then they both turned on. went ahead and threw em in and everything is good to go

really appreciate the help, and a BIG thanks to bottomline2000 for the spot on diagnosis

i really love the TYF and all the great members that help guys like me get through all these projects

 

[bottomline2000]

i feel like a big ole **** now, but i got it all working... bottomline2000 hit the nail on the head, i just didnt give it enough time to fully warm up. to test them, i made 4 temp jumpers with spade connections on either end and placed the fans on a work bench, removed the clutch fan and let the truck warm up, then they both turned on. went ahead and threw em in and everything is good to go

really appreciate the help, and a BIG thanks to bottomline2000 for the spot on diagnosis

i really love the TYF and all the great members that help guys like me get through all these projects

No problem!

 

[Captain_hi_c]

I installed E fans on my 04 Yukon last month, using LS1fans.com harness and EFI live that I bought from Black Bear to activate the PCM pins myself.

My yukon already had the big radiator.

Bought the fans from rock auto, and they are the higher blade count OE ones for an 08 yukon.

The harness from LS1fans.com was a real good quality harness with labels on everything but there website is not updated for directions and there were no pictures for the install instructions on there website. I even email them with a question about the ground wire coming off of the passenger side fan plug, to see if there was an existing bolt you use or if you had to make your own hole. There reply was very vague so I wound up making my own hole to ground.

Only other problem I ran into was I had no bolts for the fans to go into the top of the radiator core support. I didn't think about it and I didn't see it mentioned in the e-fan thread before. So I just borrowed one bolt out of the radiator for now.

And I am still using the stock Alternator with the stock pulley for now.

Also at the same time I installed a Airaid MIT tube for an 05 yukon.

Still it was fun and makes the truck look newer and gets rid of the loud clutch fan in the summer.

 

[beav626]

You will want that alternator soon. The E Fans will draw quite a bit of power.

BTW install looks good