Electric Fan Conversion Question

[Matthew Jeschke]

Awe sweet, I'm shopping right now for the fans. I thought that might be the case. Looking at NNBS 2500 fans with 7 blades but not for sure how to tell if they are 700W or the 400W.

Trying to locate better fans on Rock Auto... a 2010 2500 Silverado should be the bigger fans no? These HERE say are w/ tow package. However, the width and height don't make sense up with the radiator core HERE for my vehicle 2001 Tahoe. Fans are 9" taller and 5.75" wider. Although radiator core sizes are same between 2010 and 2001! Bit confused? Photos look exact same between GMT800 and GMT900 fans.

No luck on eBay nor local junkyard to source decent fans. It's like 50$ cheaper for the light duty fans on eBay used. Not worth it.

 

[Tonyrodz]

I know @Doubeleive is familiar with those fans.

 

[Doubeleive]

these are 700w. I can't advise on buying anything aftermarket, there are dual 5 blade 700w fans, but unless you can see the motor part number then no way to really verify otherwise unless you are 100% sure it came out of a K5L optioned vehicle

Cooling Fan Assembly ESCALADE ESV 07 08 09 10 11 12 13 14 | eBay

Model: ESCALADE ESV. CADILLAC ESCALADE ESV 07-08 Fan Assembly. CADILLAC ESCALADE ESV 09-14 Fan Assembly, (dual fan), 7 and 9 blade fans. CADILLAC ESCALADE 09-13 Fan Assembly, 6.2L, (dual fan), 7 and 9 blade fans.

www.ebay.com

07 08 09 10 11 12 13 Escalade Ext Fan Assembly 6.2 15780795 | eBay

Model: ESCALADE EXT. CADILLAC ESCALADE 09-13 Fan Assembly, 6.2L, (dual fan), 7 and 9 blade fans. CADILLAC ESCALADE 14 Fan Assembly, (dual fan), 7 and 9 blade fans. CADILLAC ESCALADE 07-08 Fan Assembly.

www.ebay.com

Radiator Fan Motor Assembly Dual Fan 6.2L Fits 07-14 ESCALADE 664690 | eBay

ESCALADE 09-13 Fan Assembly; 6.2L, (dual fan), 7 and 9 blade fans. ESCALADE 14 Fan Assembly; (dual fan), 7 and 9 blade fans. ESCALADE 07-08 Fan Assembly;. ESCALADE ESV 09-14 Fan Assembly; (dual fan), 7 and 9 blade fans.

www.ebay.com

Radiator Fan Motor Assembly Dual Fan Fits 07-14 ESCALADE 184763 | eBay

ESCALADE 09-13 Fan Assembly; 6.2L, (dual fan), 7 and 9 blade fans. ESCALADE 14 Fan Assembly; (dual fan), 7 and 9 blade fans. ESCALADE ESV 09-14 Fan Assembly; (dual fan), 7 and 9 blade fans. ESCALADE 07-08 Fan Assembly;.

www.ebay.com

 

[Matthew Jeschke]

@Doubeleive thanks! My head was spinning trying to understand which ones fit and which ones had which motor. Felt silly asking for help. Really appreciate the ebay links! I ordered one of the 9 blade fans off eBay. Couldn't find those on RockAuto.

 

[Rocket Man]

Cadillac fans were too good to be true. I just did a test fit. Would be a nightmare to mount them. They aren't even wide enough. Unless you're swapping JUST the fans or the fan motors this probably isn't a good idea. I'm going to try and return them then just buy the proposed truck fans.

Most of the time, the people on this forum are the “LS experts” not the guy at the wrecking yard. We have done these conversions ourselves so my best advice is to follow what the people here say to do, to the letter. I myself admire the ones who have gone before me and done all the trial and error, because I don’t like to waste my time and if someone else has already gone through the pain of it, why do it again? I do not remember advice to use NNBS fans. The NBS fans for MY 05 up is what I remember using.

 

[Matthew Jeschke]

Most of the time, the people on this forum are the “LS experts” not the guy at the wrecking yard. We have done these conversions ourselves so my best advice is to follow what the people here say to do, to the letter. I myself admire the ones who have gone before me and done all the trial and error, because I don’t like to waste my time and if someone else has already gone through the pain of it, why do it again? I do not remember advice to use NNBS fans. The NBS fans for MY 05 up is what I remember using.

For sure! I shouldn't have deviated from the plan. A little piece of me was like I need to buy something I worked so hard scavenging at the junkyard lol Typically I have some great finds but realized I've picked over everything they had in the lot... Switching to Cadillac's sounded like a good idea but then... Fitment! YUCK.

I've got to ask, a K5L is the NNBS Escalade? I assumed it was a 2500 truck. Searching internet shows a 2 door blazer.

 

[Matthew Jeschke]

Fans came in. Now to get the junction block and some factory screws to hold them in place.

 

[mattbta]

Fans came in. Now to get the junction block and some factory screws to hold them in

I installed E-fans on my 2001

Did the efan swap on my 01. Used factory 05 fans and harness had the comp tuned to run them. Both fans come on when I start the truck cold. Gets to 205 and sits never hotter but fans never go into high.. if I turn the ac the both kick on high. Is this normal operation for them?

www.tahoeyukonforum.com

 

[Matthew Jeschke]

I got the rebuilt fan junction block from @ScottyBoy I 150% recommend working with him. Saved me grief of eBay (bad parts), scouring junkyard (they didn't have it), and rebuilding the block. He cleaned it up and it looks AWESOME, I mean like new!

Yesterday I got to installing it. Here's a few notes and questions. My goal is to have the EXACT or as close as humanly possible to the same routing & cable management as factory.

Pictures are facing the fender, left hand is front of vehicle.



QUESTION 1 The power lug for fans, I assume it mounted to the junction block left hand side?

I had to grind an ear off the right hand side of photo for it to fit.


QUESTION 2 The wire loom goes under the junction block parallel to the fender?

I tried routing it multiple different ways but that seemed to be the most logical. The red power line / lug was a touch too long though...?

Also it's a VERY tight fit with the relay which I located under that green connector.

QUESTION 3 I assume the relay functions as a OR essentially to turn on the fans when the AC compressor goes on? That it's not on the actual 2005+ trucks, they are computer controlled for AC fans?



QUESTION 4 These two connectors were originally held by christmas tree clips in the void the fan junction block now occupies. They are now loose under the junction block cover. How does the factory manage those in the newer trucks?

This is as far as I've got so far. The harness is now tucked away till I can figure out how it's routed to the fans themselves, get the pin in the PCM, and the AC clutch spliced in.

 

[ScottyBoy]

Yes, the extra relay I added in the harness is needed to convert the AC compressor clutch trigger wire to work with the fan harness. And yes, its a pretty tight fit under the fuse block stuffing the harness and relay underneath the fuse block, but it just BARELY fits. On the 00-02 trucks, there is no AC pressure switch that sends a signal to the ECM. But there IS a pressure switch on 03+ trucks. Since that pressure switch is there, it sends a signal to the ECM to let the computer know when the AC pressure is high enough to trigger the fans to turn on. Since the 00-02 trucks do not have this, you have to tie into the AC compressor clutch wire instead of the ECM. The clutch wire is positive, not negative. That's why the extra relay is needed, to change the positive signal from the clutch wire to negative. Then that relay sends a negative signal to the 05-06 OEM relay block which ends up turning the fans on whenever the AC compressor is running. This works okay for the MOST part. The ONLY drawback is it will still trigger a fan to turn on in cold weather when you have the defroster on, because the compressor turns on when the defroster is on. I hope all this makes sense. But I have had my fans wired like this since 2010 and they have worked fine ever since, other than a fan running un-needed in colder weather when the defroster is on.