Ok guys i have been searching but im still?
Heading to the salvage yard tomorrow in hopes to find some e fans for my truck
My truck rad measures 34" from end to end thats counting the end tanks. So im guessing the 05-07classic fans is what i need?
Is their any others like 05 up tahoe yukon sierra ect or just silverado?

Now if i get everything fans and oem harness it will trigger off of pin 42 once i have it turned on in the tune?

 

Forgot to add my truck is a 03

 

No, you need the LS1 fans. The 05+ truck fans fit the radiators with a 34" core, the whole thing is like 40" I think.

But its a good idea to upgrade the radiator at the same time. All 05+ gm trucks/suvs had them.

Factory they are 2 pin; 42 and 39 I think.

 

Damm damm damm
Spent half the day online researching and thinking the entire time i had a 34
So if i did ls1 fans what cars would i find them on? And how do they fit and look after install

 

02 or so camaro, firebird, trans am, maybe corvette as well. You need to use a little bracket or something to hold them to the rad. I used a little strip of metal with 2 holes in it at one point

 

Fabing a bracket to mount them is no big deal for me. I just dont like wiring lol
I guess what i will do is just get the fans tomorrow and then order a premade harness.
Prob just install everything when i do my cam swap in a couple weeks
Im guessing if i buy a harness it will have all the details for installing it? Also where it hooks into the ecu?

 

I would recommend the 05+ OEM efans. They do require a 34" (core) radiator, but you get that perfect OEM look and function. If you can get your hands on it, use an OEM harness with pins 42 blue and 33 (red for my 00, should be green connector on 03 pcm). I just did a bunch of "upgrades" on mine, and one of the few things that went well was the efan install, I even used the factory harness on my 2000 fully integrated with the PCM. All the relays and main wiring tucks underneath the electrical center with no exposed relays. Wiring is also OEM for good reliability and got mine for half the price of an aftermarket harness.

 

I installed ls1 fans on mine 2 years ago that i got off ebay for $80. Got the harness from ls1fans.com and the wiring was simple.
So far no issues with fan/harness or overheating.

 

I have the LS1 fans and harness from blackbear and they have worked flawlessly for a few years now.

 

Well im going to look for a 05-07 34 and fans tomorrow but if i dont have any luck im just going with the ls1 fans
I think it will be much more easy to find those around here