Just got factory Efans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matthew20061 · 01-06-2011, 04:49 AM

Just scored some factory electric fans from the junkyard for $145. Great deal for up here.

I've already got them all installed and working. I built my own wiring harness off of a wiring diagram for the factory electric fans from 05+ trucks. It uses 3 relays which are switched off of the PCM via pin 42 and pin 33. I setup my tune with HP tuners and set the turn on and off temps of both the fans and the AC pressure on off temps so the fans kick on when the A/C is running. So far so good!

orange70350 · 01-06-2011, 10:02 PM

hi i just came into a set of fans like the ones you have. i was woundering if you can give me a few more detailes on how to make a wiring harness for it and set them up i have a 2000 silverado thanks

loudnlifted88 · 01-06-2011, 11:07 PM

what kid of vehicle did those come out of im looking for a set like that to make fit in my truck thanks

droppedgmc · 01-07-2011, 12:11 AM

those came on the '05 and up trucks. I use a set of fans from an ls1 camaro.

matthew20061 · 01-07-2011, 04:47 AM

Quote:

Originally Posted by orange70350

hi i just came into a set of fans like the ones you have. i was woundering if you can give me a few more detailes on how to make a wiring harness for it and set them up i have a 2000 silverado thanks

Here's the wiring diagrams I used to build my harness. The last one is the one I used, the fans are controled via pin 33 and pin 42 on the pcm. Research it on performancetrucks.net there tons of info on this swap there. Couldn't have done it without reading everything on that site.

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loudnlifted88 · 01-07-2011, 09:12 AM

Quote:

Originally Posted by droppedgmc

those came on the '05 and up trucks. I use a set of fans from an ls1 camaro.

i though they also cam on 02 and up tahoes

DirtyLarry · 01-07-2011, 12:08 PM

Great score! I really dig those fans used on the later GM trucks.

Jacfourteen · 01-11-2011, 04:27 PM

I'll have to look into some of these for my 01 Hoe, not only for performance/mileage, but also because my A/C doesn't work all that well when sitting at a standstill.

matthew20061 · 01-11-2011, 06:34 PM

Quote:

Originally Posted by Jacfourteen

I'll have to look into some of these for my 01 Hoe, not only for performance/mileage, but also because my A/C doesn't work all that well when sitting at a standstill.

It's a great upgrade for sure! I think I read that some of the trucks like your tahoe might have the narrower radiator 28" I think? So the Efans might not bolt on unless you swap to a different one, I think 32", which comes standard on the SS models and HD's I think. I think thats what I read at least might want to check into it though, as they sure look nice under the hood. Looks completely factory!

Jacfourteen · 01-12-2011, 01:02 AM

Quote:

Originally Posted by matthew20061

It's a great upgrade for sure! I think I read that some of the trucks like your tahoe might have the narrower radiator 28" I think? So the Efans might not bolt on unless you swap to a different one, I think 32", which comes standard on the SS models and HD's I think. I think thats what I read at least might want to check into it though, as they sure look nice under the hood. Looks completely factory!

Thanks for the info, I'll look into it.

droppedgmc · 01-12-2011, 11:17 AM

Quote:

Originally Posted by matthew20061

It's a great upgrade for sure! I think I read that some of the trucks like your tahoe might have the narrower radiator 28" I think? So the Efans might not bolt on unless you swap to a different one, I think 32", which comes standard on the SS models and HD's I think. I think thats what I read at least might want to check into it though, as they sure look nice under the hood. Looks completely factory!

that is correct. they did use a bigger radiator for the factory efans

You'll need the 34" Radiator from 05+ trucks or 00-04 2500 series trucks

01-06-2011, 04:49 AM	#1
matthew20061 69' Chevy Stepside Join Date: Mar 2008 Location: Anchorage, Ak Posts: 526	Just got factory Efans Just scored some factory electric fans from the junkyard for $145. Great deal for up here. I've already got them all installed and working. I built my own wiring harness off of a wiring diagram for the factory electric fans from 05+ trucks. It uses 3 relays which are switched off of the PCM via pin 42 and pin 33. I setup my tune with HP tuners and set the turn on and off temps of both the fans and the AC pressure on off temps so the fans kick on when the A/C is running. So far so good! __________________ -Matthew -69' Chevy Custom/10 Shortbed Stepside 2WD "Copperhead" - Restored, 6.0L LQ9 Built. L92 Heads and LS3 Intake with Comp Cam 223/231 .610/.617 112 LSA, 4L60E with Shift Kit and Circle-D 3200 Stall Converter ~Build Thread -1957 Chevy BelAir 2 Door Post Sedan, Full Frame off Restoration done myself - 6.0L with T56 six speed -1957 Chevy BelAir 2 Door Post Sedan - Nearly rust free AK car, Project in the waiting -2003' Chevy Silverado SS AWD 6.0L! - Daily Driver

01-06-2011, 10:02 PM	#2
orange70350 Registered User Join Date: Sep 2009 Location: St. Charles, IL Posts: 43	Re: Just got factory Efans hi i just came into a set of fans like the ones you have. i was woundering if you can give me a few more detailes on how to make a wiring harness for it and set them up i have a 2000 silverado thanks

01-06-2011, 11:07 PM	#3
loudnlifted88 Registered User Join Date: Jan 2010 Location: Wales,Maine Posts: 776	Re: Just got factory Efans what kid of vehicle did those come out of im looking for a set like that to make fit in my truck thanks __________________ IM ONLY 18 AND LOVIN IT IF MUD AINT FLYIN YOU AINT TRYIN! 1badgmc- Just think. Someone worked hard to make it look that bad. 1988 chevy stepside 305 five speed Build thread http://67-72chevytrucks.com/vboard/s...d.php?t=383945 1994 GMC ext. cab short box 350 auto Build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438873 1996 GMC 2500 ECSB 454 4l80e: build thread http://www.gmt400.com/forum/showthre...gmc-2500-build 1998 GMC K-1500 ECSB 305 auto partd truck 1999 GMC K2500 suburban 350 4x4 Dads project 1981 Corvette 350 auto Also Dads project 1989 Corvette 350 auto ^^ 1998 GMC K1500 ecsb 305 auto Brothers project

01-07-2011, 12:11 AM	#4
droppedgmc Truck Enthusiast Join Date: Dec 2006 Location: Arlington, WA Posts: 1,346	Re: Just got factory Efans those came on the '05 and up trucks. I use a set of fans from an ls1 camaro. __________________ '85 swb

01-07-2011, 12:08 PM	#7
DirtyLarry Windy Corner of a Dirty Street Join Date: Jun 2003 Location: Pueblo West, Colorado Posts: 2,926	Re: Just got factory Efans Great score! I really dig those fans used on the later GM trucks. __________________ Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles Instagram

01-11-2011, 04:27 PM	#8
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Just got factory Efans I'll have to look into some of these for my 01 Hoe, not only for performance/mileage, but also because my A/C doesn't work all that well when sitting at a standstill. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's



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