OEM GMT800/NBS Electric Fan Harnesses For Sale

[ScottyBoy]

I currently have a few Cooling Fan harnesses available for sale. For anyone who doesn't already know, I pull these fan harnesses from junk vehicles and "refurbish" them as a standalone harness. By the time I'm done with it, it pretty much looks like a brand new fan harness. I completely clean and inspect EVERY inch of the wiring, the relay block, the plugs, etc. If needed, I make any needed repairs, because sometimes the wires may be cut, or the insulation damaged because some of these vehicles were in a collision. If any repairs are needed, l solder the wire back together and cover the repair in marine grade heat shrink tubing. Sometimes I may need to replace a cracked/damaged plug. Then l personally test each harness for proper operation, and make sure all the relays function as they should. Then I apply silicone dielectric grease to each plug/connection to help prolong the life and to help seal out moisture. Then I completely wrap the entire harness in all new wire loom before shipping it out. I treat each and every harness as if i was installing it on my own truck. If you have a 00-02 and are using the AC compressor clutch wire as one of the trigger wires, l can splice in an additional relay for an extra $20. (Like tge one pictured below) So for a 00-02 harness, I charge $175 shipped. For a 03-06, I charge $155 shipped, since I dont need to wire in an additional relay. I've sold dozens of these harnesses over the last few years not only on this forum, but several other GM truck forums and I dont think I have one single unhappy customer. If you simply search my name on here, I'm sure you find lots of raving reviews from plenty of my past customers.

 

[Staggered 02]

Message sent. Thanks.

 

[Matthew Jeschke]

So this wires up just like factory? I'm not familiar with where the factory places the fan junction block...

 

[Fless]

It's mounted between the underhood electrical center and the firewall. Like under the curved fender support bracket.

 

[ScottyBoy]

It's mounted between the underhood electrical center and the firewall. Like under the curved fender support bracket.

Correct. It basically clips right onto the stock fuse block, and it fits under the stock fuse block cover. OR....You could also swap over to the 05-06 fuse block cover, and that one actually has an access cover to gain access to the cooling fan relays. Otherwise, you need to pull the whole cover off to access the relays.

 

[LADenali]

Hi, are any harnesses available?

 

[ScottyBoy]

Yes I still have some.

 

[ScottyBoy]

I just procured several more of these harnesses. I already have 2 of them completely refurbished and ready to ship out. If you have been wanting to swap your 00-04 over to electric fans, hit me up and I can get you squared away. I have literally DOZENS of happy customers on this forum alone who have purchased from me, so you can rest assured that you are dealing with a reputable seller.

 

[Humbertodlc]

Do you still have any harness available for the 03-06?

 

[ScottyBoy]

Yes, I currently have two available as of 6-22-25

 

[Humbertodlc]

Yes, I currently have two available as of 6-22-25

How do I go about purchasing one?

 

[Fless]

How do I go about purchasing one?

Send @ScottyBoy a private message via the forum's "Conversation" feature.

 

[Hoelover]

I currently have a few Cooling Fan harnesses available for sale. For anyone who doesn't already know, I pull these fan harnesses from junk vehicles and "refurbish" them as a standalone harness. By the time I'm done with it, it pretty much looks like a brand new fan harness. I completely clean and inspect EVERY inch of the wiring, the relay block, the plugs, etc. If needed, I make any needed repairs, because sometimes the wires may be cut, or the insulation damaged because some of these vehicles were in a collision. If any repairs are needed, l solder the wire back together and cover the repair in marine grade heat shrink tubing. Sometimes I may need to replace a cracked/damaged plug. Then l personally test each harness for proper operation, and make sure all the relays function as they should. Then I apply silicone dielectric grease to each plug/connection to help prolong the life and to help seal out moisture. Then I completely wrap the entire harness in all new wire loom before shipping it out. I treat each and every harness as if i was installing it on my own truck. If you have a 00-02 and are using the AC compressor clutch wire as one of the trigger wires, l can splice in an additional relay for an extra $20. (Like tge one pictured below) So for a 00-02 harness, I charge $175 shipped. For a 03-06, I charge $155 shipped, since I dont need to wire in an additional relay. I've sold dozens of these harnesses over the last few years not only on this forum, but several other GM truck forums and I dont think I have one single unhappy customer. If you simply search my name on here, I'm sure you find lots of raving reviews from plenty of my past customers.
View attachment 441105View attachment 441106

I would like to purchase a wiring harness plz . You can text me at (702) 885-8207 thx

 

[Fless]

I would like to purchase a wiring harness plz . You can text me at (702) 885-8207 thx

It's recommended to keep your personal info private by using the forum's CONVERSATION function, so you can private message another member.

 

[Hoelover]

It's recommended to keep your personal info private by using the forum's CONVERSATION function, so you can private message another member.

Thx man appreciate you

 

[scuzz215]

If using one of these harnesses for a 2001, do I still need to have the fans turned on or programmed in the computer?

 

[ScottyBoy]

If using one of these harnesses for a 2001, do I still need to have the fans turned on or programmed in the computer?

Yes. The harness has two trigger wires. One is the temperature controlled trigger wire which is tied into the computer. It triggers the both fans to come on at low speed when the computer sees the coolant temperature rise above a certain threshold. Most tuners have it set somewhere between 205 and 210 degrees. The second trigger is tied into the AC compressor. It turns one of the fans on whenever the AC is running. ( Regardless of coolant temperature, so even if the coolant us only 170 degrees, the AC will still turn one of the fans on if the AC is running) When BOTH triggers are on at the same time then both fans will be running at high speed.

 

[Marky Dissod]

If using one of these harnesses for a 2001, do I still need to have the fans turned on or programmed in the computer?

If using one of these harnesses for anything pre-05,
the GM OE truck & SUV 'tunes' likely do NOT have 2 electronic fans enabled,
and also do NOT have the trouble codes for electronic fans enabled - in other words,
the pre-05 GM OE tunes are not 'expecting' to control electronic fans /
the pre-05 GM OE tunes are 'set' to let a hydraulic-mechanical fan do its thing.

So YES, pre-05 GM OE truck & SUV 'tunes' need fan settings updated.