I installed E-fans on my 2001

[Xav8r]

A smaller pulley will make the alternator spin faster. This means at idle it will be putting out more power/spinning faster than normal. This way if you have a large draw like fans, your lights wont be dim at night at idle and your gauge wont read 10-11 volts. Yes your belt will need to be slightly shorter.

Thanks Marc. That's just what I was looking for. How did you go about figuring the proper size belt after your upgrade? Also, I'm not totally familiar with '99's but I note that you have a 140A alt, was that a significant upgrade from stock or was your original similar to my 130A and I need to step up to a 140A? FYI, my truck is not a state of the art AV showroom on wheels!

Thanks again.

 

[gpracer1]

Thanks Marc. That's just what I was looking for. How did you go about figuring the proper size belt after your upgrade? Also, I'm not totally familiar with '99's but I note that you have a 140A alt, was that a significant upgrade from stock or was your original similar to my 130A and I need to step up to a 140A? FYI, my truck is not a state of the art AV showroom on wheels!

Thanks again.

My original alternator was only 105 amps, and the whole case was different in shape and size than the 140. The belt size was shorter with stock alt and small pulley, but when I went to the bigger alt and put the small pulley on it, I could use the oem belt.

 

[01HDtahoeNJN]

Great thread thanks Scott!!!
How much did this all run you guys!?

 

[01HDtahoeNJN]

Would these work

07+ efans for v8 silverado so it says

 

[tRidiot]

Ok, I got my 05+ cooling fans and my BlackBear harness. Problem is, it came with zero instructions.

I've got the power and ground wires and the Blue 42 and Green 33 wires.

I currently have a set of generic e-fans hooked up through the rad with zipties (hence I'm now replacing my rad at the same time). They are triggered by a temp probe in the radiator, and also by being tied into the A/C compressor.

I did not get a "tune" from BlackBear... can I make this work without a tune? At least for a little while? It's cold out, so I'm thinking I can get by for a few weeks without fans if I need to (heck, I went most of the summer without them, just had crappy A/C). I'm just wondering if I can hook that A/C wire to the Green 33 wire to get the fans to come on "high" and the Blue 42 wire will trigger them for low?

I'm just a bit confused, as BlackBear's site has zero instructions as to what's needed, just has an option for the tune or the harness, wasn't aware I needed BOTH, if I do. It's not a money thing, I don't mind the $55 for the tune, just that I have to replace my rad sooner than later and was hoping I could either hook things up to run sub-optimally (which ought to be fine in winter) or whatever for the moment.

Someone throw me a bone here?

Never had any communication from BlackBear about my order or shipping, and no instructions, either. Kinda disappointing, I guess.

 

[Rivieraracing]

Tridiot, check this link out and go to post #34, hook up your main power wire inside the red juction box in the fifth picture and hook your grounds to the bracket bolt that holds the junction box!! http://www.tahoeyukonforum.com/forum/showthread.php?t=9400&page=6

As for rigging up the fans to work on your truck without a tune, I wish I could help you there!! Maybe someone else will chime in on that!!

 

[ScottyBoy]

No, it will not work without a tune. Not tying into the computer pins anyway. You could hook it up to the temp probe that you currently have, and hook the high speed wire to you AC wire.

 

[tRidiot]

So green is high-speed? And blue is low-speed? Is that how it works? If so, I COULD potentially hook the blue to my current temperature probe and the green to my A/C compressor. This ought to yield me somewhat normal operation for the short-term.

I just was hoping not to have to put that temp probe back in through the fins on my new radiator. This is already the 2nd replacement I've done...

 

[tRidiot]

No one?

 

[Rivieraracing]

Wish I could help you but haven't had to hook my up anyway other than the way it was meant to be hooked up and used!! I'm guessing that the green pin (A/C) is the passenger side fan and the blue pin is the drivers side fan and maybe when it really needs to cool down, the computer will get voltage to both pins which makes both fans kick on!! Just is just a guess though, hopefully someone else will chime in or else PM Jennabear since you have their harness, maybe they can tell you how to rig it up!! Good luck!

 

[Xav8r]

Hey Guys ... I'm asking for a little help with this one ...

'01 Tahoe, BB tuned, new e-fans and LS1 harness through Justin ...

When I turn on my AC the passenger fan triggers on high, however it cycles from high to OFF 2 to 3 times a minutes. Does this sound normal, or like anyone elses install?

Also, I warmend the truck up and expected the drivers side fan to trigger on HIGH, however never did get it to turn on. Does anyone know what the trigger on temperature setting is for the Blue 42 pin wire? It is cold outside, and I never did get the temp gauge to read above 210, however I did expect to see the fan kick on high after a stable 190+ for 10-15 minutes.

Thanks in advance ...

 

[Rivieraracing]

Pm'ed you!!

 

[ScottyBoy]

Jenna told me that the fans dont kick on until 209 degreez.

 

[Rivieraracing]

That's good to know, I was always curious on when the computer kicked the fans on!! Thanks for sharing the info!

 

[01Konvict]

I installed mine today and I used M8x1.25 thread bolts for the new fans. The old bolts didn't fit the relocated holes. Just a FYI for reference.

 

[01HDtahoeNJN]

How are they working!?!

 

[tRidiot]

Hey Guys ... I'm asking for a little help with this one ...

'01 Tahoe, BB tuned, new e-fans and LS1 harness through Justin ...

When I turn on my AC the passenger fan triggers on high, however it cycles from high to OFF 2 to 3 times a minutes. Does this sound normal, or like anyone elses install?

Also, I warmend the truck up and expected the drivers side fan to trigger on HIGH, however never did get it to turn on. Does anyone know what the trigger on temperature setting is for the Blue 42 pin wire? It is cold outside, and I never did get the temp gauge to read above 210, however I did expect to see the fan kick on high after a stable 190+ for 10-15 minutes.

Thanks in advance ...

Interesting...

Got my BB harness wired in professionally by a local 12V installer who knows well what he's doing. The triggers worked when checked manually against a ground, activated the fans on low and high.

Since I didn't have time to get a BB tune and they said the local event was not looking promising, I had a local guy tune the truck for $75.

I had wired the high-speed trigger to the A/C compressor using a relay to convert it from positive to negative so it would trigger properly. My fans also do what the poster above said, with them cycling on 2-3x per minute with the A/C compressor. I don't really know why my A/C compressor does this, but to my knowledge, it has always done it. Never does my compressor come on and stay on continually, at least not the I've noticed.

The plan was to simply unplug the relay from the compressor to the trigger wire when the tune was complete. However, after the tune, the fans do not work. At least, the computer is not controlling them. The guy showed me on the software where he has the fans enabled by setting them from 2 (no fan) to 0 (2 fans) and various settings, but even with a manual override command from the laptop, the fans will not engage.

So I plugged the relay back in so they would work with the A/C.

Just a frustrating process.

 

[Xav8r]

A little follow up info from Justin ...

Here are the conditions:

Pin 42 alone, both fans come on low,
A'/C alone, one fan comes on high
Pin 42 and A/C together, both fans come on high

Pin 42 should trigger at around 210 degrees and then back off at 199. And it is very common for the compressor to cycle that much unfortunately.[/SIZE]

I still have not confirmed the drivers side fan is working by either reaching the ~210 temp or grounding out the pin. And I have not seeing the both fans on low, which I'm assuming means I've never reached the temperature threshold.

I am a little bummed to have the AC cycle the passenger fan from high to off so frequently as I can feel the drain on power resulting in increase throttle for the same speed (via either cruise control or foot pressue). Plus it just doesn't seem like the fans or the harness and relay will last long being turned on and off so frequently.

But so far I haven't seen anybody post that they've uninstalled the efans or gone back to a water pump mounted fan.

 

[01Konvict]

I got mine installed and I wired the LS1Fans/BB harness up to the 14v ac wire under the fuse panel. However when I turn the ac on none of the fans turn on. I am now troubleshooting the fans and harness to figure out how to activate the fans. I didnt reach 209 for the regular fan to turn on, so I couldn't verify that one either.

 

[Rivieraracing]

Unless you were told otherwise from Justin, you should hook your 12v wire up to the little red jump box next to the engine bay fuse box, I also attached my grounds to the bracket that holds the jump box!!
As for the AC wire, where did you attach the trigger wire to? There should be a wire loom running vertically next to that red jumper box, that's where I was told to tap into the ac circuit. There were 3 wires in there that looked like they could be the wire I was suppose to find but all three did different things!! One had the fans on all the time, no matter if the ac was on at all. Then the next one didn't trigger the fan on at all, no matter what setting the ac was on, and the 3rd one that I found in that loom ended up being the correct one. Post a pic of where you tapped in for the AC wire if you don't mind and get a chance!

---------- Post added at 06:46 AM ---------- Previous post was at 06:43 AM ----------

Check this link out and look at post #34, the last picture shows where I attached my grounds, tapped into the AC wire, and also if you look the right top of the red box, shows where my power wire is hooked up to as well!!

http://www.tahoeyukonforum.com/forum/showthread.php?t=9400&page=6