DBTKDT

question? if my fans are not set correct and both fans are runnng all the time will it cause the harness to start to melt and not work cause the fans running full speed all the time draw too much power? ugh! help!

Could maybe the blue and the green pins be wrong on the harness? I have them in the right location and the way there were labeled. Weird thing is though.........the oem low speed wire green pin 42 and the high speed wire is blue pin 33 but the harness is the other way around?

Shouldn't the high speed kick in @ 232?

Well they never would go on high @ that temp, they would both run on low @ that temp. Now they just run full blast, both fans.............

I'm going crazy for the last 3 weeks! I've had a Wheatley tune in my 04 yukon denali for years now with 05 efans and Black Bear dual pin harness and flawless! About 3 wks ago all the sudden my fans have been kicking on high speed all the time....... today I hooked a tech 2 up and saw that the computer is turning both fans on high at 204 degrees? It has never ever done this before? I got new relays and a new harness from Justin thinking it was that but I guess not? Awesome service from Justin by the way! I'm just lost now and can't figure this out? What should the table be set at and could the tune just go out of wack and change like that? Please help! Thank you!

i switched the relays and still does goofy things? I dont get it? I feel like I'm going crazy.....................lets just say there is nothing wrong with the harness, what else could i trouble shoot? All the terminals are pushed in too................

Mine did that too...................it is hit and miss. I did push in the wires and I thought that was it then it was running crazy again and now its fine? I'm going crazy! Maybe relay? When they are running full blast my volts are suffering, and I have a145 amp alt. Hate to see that.

Runs at perfect temp. I'm lost.

I'm needing help please. I have an 04 yukon denali with 05+ efans with the dual pin blackbear harness. Had this set up for years and no problems at all. Now for the last few week both myfans have been running on high speed all the time? I'm lost and don't get it at all? what would cause them to run on high speed all the time no matter what the temp is or the ac on? Help

I found a wire that wasn't pushed in all the way in the harness. That's all it was the whole time! Works like oem now! Awesome! Thanks for all the input and help guys!

The relays are under the hood connected to the fan harness. I have a buddy that can view what the pcm is calling for when the fans go on, that would let me know right away.

Ok, can someone answer some questions for me? I have an 03 silverado 1500 hd. It has the LQ4 and I put 05 oem e-fans in it about 3 months ago. I have a Wheatley tune and the fans are programmed in now like factory. I have the Black Bear dual pin harness installed. Should the harness turn on both fans on low when the pcm calls for them to turn on or one fan on high? Oem is both fans on low. How is it supposed to work with that harness? I was told it performed just like oem and it isn't. The one fan on high is loud. Also my fans stopped working and I moved the relays around and cleaned them up and they work again? Three months and the were crudded up some already? I put new relays in today thinking I had a bad one and same thing with all new relays? I just want the fans to operate like oem? Is it setting in the pcm or is the harness messed up? Any thoughts would be helpful. Thank you!

I cleaned the relays and everything is working again. They were a little gooped up? Thanks for everyones help.

Alternator bracket, the terminals looked ok, i'll check out the ground tomorrow. Thank you for your help tonight!

How do you know if its the relays? They look ok, i took them out and cleaned them. Anyway to check them?

in the harness?

Just noticed my 05 e-fans on my 03 silverado aren't working!was talking to my neighbor with the truck in park while running and looked a the temp gauge and it was climbing fast! I have 05 fans with the blackbear harness and have been installed in my truck for three months and no issues at all. I need some help fast on where to even start? Help

What Hot Rod issue was this in? I have Hot Rod issues from at least 08 and i can't find this? Is say Feb 09 but its not in that issue?

Thank you for that great info! Looks like you really know your stuff. I was looking to just use oem gaskets and be done. would like to do a cam but don't want the truck loping like a race care. Any thoughts? I know i can do a cam cheaper than rocker arms and get more gain too. Looking for some good thoughts. Thanks guys!

300hp and 360tq stock. I think im making more than 315 at the crank? I'm thinking the drive train on this truck is sucking up some good power, plus the 33" tires.

Went to the dyno(dynojet) today and ran it in third gear, I got 267hp and 286tq. Looking for some input? Again a LQ4 with cold air, 05 e-fans, and 93 Wheatley tune. I have the 4L80e trans with 3:73 gears(14 bolt) and 33" tires. I will post the graph in a little bit. What am i making at the crank?

I have been thinking about putting some 243 heads on my LQ4? I think this a complete just bolt them on and go your mary way. What would my compression raise up to? Any ideas how much gain i could get with the 243's? I'm also thinkinking of then putting on some 1.8 rockers to give me a little more lift. I don't think i would ever do a cam so that would be a simple bolt on at that time of swaping heads. Does this make sense at all? Any other thoughts? I already run 93 with my Wheatley tune so i'm aware of the bump in octane needed. Thanks

hello?

Also what percentage is used for the 4L80 for drivetrain loss?

Ok, I'm going to try to take my truck to a dyno in the next few weeks. Looking for some numbers these LQ4's put down stock? I have a 03 1500 HD and have a cold air, 05 e-fans, and a 93 Wheatley Tune, the 1500 HD's have a 3:73 in the14 bolt rearend and the 4L80 trans. Just looking for a benchmark. The truck feels really strong now and it become fun to drive! Too bad it weighs 6000+lbs!