03 Silverado 2500 Electric Fan Conversion (9 Blade HD Fans) 

Thank you, I really appreciate the feedback!

I don't think one person's commented with the 28", that's odd.

I think the biggest difference you'll notice is the air conditioning, WAY more consistent, gets cold and stays cold! I'm not nice to mine, and I can attest these cool way better than the mechanical. You can tow up a grade all day and the needle stays put. Glad you liked the video!

Thank you!

Fans are doing great, not a single issue with them or the Nelson kit, I love it. Truck gets to temp faster, stays cool easier, and ac is more consistent. Stock alternator, but I found the 145amp alternator from the 2500hd is often cheaper and a direct swap! Thanks for the feedback!

Unfortunately it involves refreshing the pcm so it would need to be a tuning device, I highly recommend the hpvi2 from hptuners, but many other platforms will do it. Not sure if a dealership would do it for you, but wouldn't hurt to call and ask. You'd pay around the same price to have a tuner do it as you would to buy an hpvi2 and do it yourself. If you have no plan on learning to tune, it's still very handy. Speedometer correction if you regear or change tire size, bidirectional diagnostic controls for engine and transmission, as well as disabling CEL for o2 sensors if you ever ditch your cats. BUT. They're a little tedious to flash, unplug radio fuse as well as any trailer brake controllers and lights before you flash! If you don't think you'll use it again, I'd just pay for a good tune and hit 2 birds. Either route will cost you $500 or so. But a heads up, mpvi2 is on backorder at the moment. Thanks for commenting!

@@EventuallyPrettyGood Thank you for the excellent help and information!

That I don't know. But I have the 145 Amp alternator. Tip: if you need to replace your alternator, buy one for an HD silverado. Direct swap, more power than the 105 amp, and it's USUALLY cheaper.

@@EventuallyPrettyGood thanks for replying.did you purchase the wiring for 03 or 11

Are you measuring to the edges of the core or edge of the tank? I'm not sure I've heard of a 42", if the core itself is 34" the kit in the description will work for you, not sure otherwise tho. Also not sure if the Nelson harness will work with the 8.1, however, they do have a harness that works using a temperature prove separate of the computer

Absolutely, even the stock 105 amp will run them, the 145 is just nice if you jump other vehicles, run accessories a lot, use an inverter etc.. I mainly upgraded mine since it charges the battery on my trailer

If I remember correctly, the passenger side fan only turns on if the ac is turned on (to cool the condenser) or at a higher temp threshold than fan 1. If you enabled the fans in the pcm yourself, double check that it is set for dual fans. An easy check is if you have a scanner with bi directional control, or in your tuning software. With hptuners, open vcm scanner, diagnostic button, tab for either system or fans, you'll be able to enable the fans individually. If it doesn't come on with ac, or when commanded by a scanner or tuner, double check your pin on the pcm for #2 fan (green wire iirc). Hope you get it figured out, I promise the swap is worth the hassle!

@@EventuallyPrettyGood Thanks for the fast reply. I have an bi directional scanner but I can’t find the option for the fans. The pcm was flashed by black bear tuners and they said the fans were enabled. When I turn on the ac the drivers side fan comes on. Maybe the engine temp and condenser temps are not high enough to enable the passenger side fan. I seen several posts and video’s saying they both should come on at engine temp. I’m at a loss

@@bradflood7112 Do you have any way to look at the tune file from Black bear? There's a few different fan configurations that can be set

@@EventuallyPrettyGood I’m sorry. I do not. I wish I did.

I'm not an expert so don't take my word as gold, but I think with your fan settings would be right on the money. One thing to note (you may already be aware) the pcm wants to see a certain temp before it goes into closed loop, usually around 180 or 190, so definitely take a peak at that while you're in your tune. Please comment back after the install and let me know how the BP harness works for ya, I'm still not a huge fan of the Nelson relay location. I pull my pcm and flash with a bench harness for safety and it makes it a pain. But you'll love those e fans, get ready for really consistent cold ac. Easily the biggest difference to me. Fan #2 will cool the condenser whenever needed, and it makes for some damn good ac lol

@@EventuallyPrettyGood Thanks for the reply. I will certainly update you on the BP Automotive harness when I install the fans. I should get the harness this week and the Fans are coming next Saturday, I'm thinking because of the Holiday On Monday. But nevertheless, I am excited to do this swap. I am going to reference this video and another video where the guy uses the BP automotive harness. It is longer and it hides behind the Fuse box. As far at the fan temps. Thinking about what you said about the pcm wanting to see a certain temp be3fore it goes into closed loop I will probably change the temps a little higher. I'll ask the tuner to turn fan #1 at 185, turn it off at 178. Second turn on at 195-200 and off at 188 somewhere along those lines. And then have him turn on the fans automatically when I turn on the AC. Stay tune. BTW I think going with the Heavy-duty Fans like yours was the best choice. My Hummer is a huge truck so it will need big fans like the one you got. I also bought an all-aluminum radiator so I will have a better cooling system then I did before. I just got the Hummer and it only has 57k miles so I want to take care of it as much as possible. I'm in California where the temps are always hot. Right now, it is 109 degrees in Riverside Ca so yeah I need this conversion.

@@EventuallyPrettyGood I almost forgot, I did buy a higher amp alternator. The Hummer H2 comes with 145 amp alternator so I purchased a 160 amp. I think it is safe to do that. Did you change your Alternator?

@@buddyrebel_Garcia I believe you can also just change the temp requirement for the closed loop, then you still get the best of both worlds. I tow a lot with mine, also a 6.0, even at 15k combined (truck trailer and truck on trailer) it still never gets over 200 degrees, they're overkill if anything, but definitely nice to have. Keeps the Trans cooler real happy too!

@@buddyrebel_Garcia Absolutely safe. It will only output what is being drawn. I have the 145 amp in mine, but it came with a 105. I keep jumpers and a lockout kit with me, I jump vehicles fairly often so the amperage is nice to have, if you're into audio It's also nice to have. If you run inverters, jump other cars, or have amplifiers and such, look into doing a "big 3" wiring upgrade, fairly cheap and easy to do. I've jumped my semi with mine, tho it had to charge it a few minutes first

I believe 2011 up to the next body style on 2500 and up, not 100% on that.

Still perfect! Gets up temp faster, ac temp stays more consistent, especially idling in traffic, no issues, noises or nuisances. Probably the best thing I've done to it!

Little to no change in mileage, however, noticeably better throttle response, more consistent air conditioning and WAY easier to work on the accessory drive. Just having the room is worth the swap imho

@@EventuallyPrettyGood Same results here, these trucks are to heavy for the fan to make much difference in MPG

@silentbravo Oh definitely. Only mod I've done that really affected mpg was regearing, and even that only got so far. The price you pay only having a 4 speed and weighing 3 tons lol

Not sure if it's a requirement, but yes, the 2500hd alternator is a direct swap, supplies 40 amps more juice and usually cheaper.

@@EventuallyPrettyGood thanks I just wanted to know... so just ask the guy at the counter for a 2002 hd silverado alternator?

TYC 622210 is the part shown in the video, the rockauto link in the description has the alternative part numbers

Thank you for the quick reply. My 8.1 suburban has a 38” radiator core not the 34”. Will this fan fit? Or will I need to find one larger? Thanks again for the help

Thanks for the sub! Also in the Midwest, also looking for a rust free longbed 🤣 People want $2500 for a good bed around here 🤬

@@EventuallyPrettyGood Oh i know its ridiculous, but then again finding one that's rust free is a needle in a haystack ordeal. I'll keep looking and if I find 2 ill send you the info.

@@Shorey121 I think I'm just gonna weld in a new bedside, have one side previously replaced.. I'd found one dent free rust free in my color last year for $500 and didn't snag it, been kicking myself since!

On the actual installation, I'd say probably 3-4 hours. The question on time would be lining up a tuner if you don't already have a tuning device. If you need to take it somewhere to have these fans enabled in the computer, you'll need it towed there unless you live within a few miles. I'd highly suggest an mpvi2 if you don't have one. Even if you don't plan on tuning, very handy for enabling fans, calibrating speedo if you change tire size, as well as a slew of diagnostic controls. You'll pay less and have the device for future use!

Perfect, not a hiccup! I think the biggest difference I've noticed is way more consistent a/c temp. Stays ice cold the whole ride now!

Yes it will

That is correct. They must be enabled in the pcm before they will operate, not exactly sure why it's set up that way. If you're concerned about getting it to a tuner or a friend capable of flashing it, you can opt for an override switch with the Nelson harness in the description, this can be used to manually enable them until you get to a tuner

@mikedownen3962 The fans would run longer than the pcm would anyways, gm ecm won't power on under 9v or so. Plus way more room for alternator and belt replacement

Nope. But, slightly better throttle response and way more consistent ac

Me? A slacker?! Okay maybe. Lol