It is independent of the PCM and even the A/C controls in the cab. I don't see how you think a clutch fan is quieter. If your truck did not come with cooling fans tuning the PCM for fans is REQUIRED. I have been considering doing that myself. here guy is saying to remove it from the AC switch and connect it to the Pin and then thru your tuning software change the settings? Powered by Invision Community, During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low, ...turning on the efans is very, very simple – just ground the green wire and the efans, Pcm Tuning For Efans And A/C Climate Control, Silikhan Publishing Group & SilveradoSS.com. After you get those, it's as simple as buying a wiring harness sold by [email protected],Nelson Performance, Rat Ron, etc. The holes for the fan to bolt on are already in the ⦠(when) I pull it off i'll change the wires and bench test it so I dont fry my PCM. The 05-06 Tahoe/Silverado electric fans can only be used if you have the larger radiator. As opposed to a clutch fan that is running at all times just at different speeds. Display as a link instead, × Its on eBay, comes with dual fans, shroud, all mounting hardware, relays, wiring, fuses, indicators and some kind of auto/manual controls that fit in the glove box. I wonder if it would change any of the other wires, I'll print both diagrams and look at them next to each other. In this way the electric fan motors are wired in parallel, causing the fan motors to spin at ⦠I also set delays between the two fans to take the initial load off the relays and charging system. 2007 Chevy Silverado 1500 Pickup RADIATOR COOLING FAN ⦠I have had one member call me after installing GM fans, he was freaking because his R134 had vented all over the front of his motor; in that situation no permanent damage happened, he re-wired his relays and added walmart R134 and the truck was fine. Your link has been automatically embedded. I have a hard time believing GM would design a system that doesn't have this kind of a very simple safety mechanism built in. Yet I have seen this happen in my own driveway with another members truck........ so a wiring question: can I use my nelson harness, and run my AC wire to pin 33 of the PCM?or do I need to change the harness? Im wanting to get all ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. Clear editor. Another says that the electric fans use energy as well, so likely no gain vs clutch. If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. Not sure about the wiring being already in the truck for electric fans , probably not since they don't come with them from the factory. The only hard part looks like a ~36 mm bolt. Electric fan conversion for 99 Silverado 5.3 Silverado Car ... What years of Camaro/Firebirds are most people using for the dual electric fans to replace the clutch fans on their trucks?Besides the wiring harness from Nelsons is there anyting else that will be needed to do the mod? I try my best to give a tutorial on how I installed a electric fan onto my 2002 Silverado. So, might have to rewire the trigger relay so that it turns into a ground trigger wire, then you can run the wire to the PCM. $35.95. My setup doesn't cycle with the compressor with Ac on or defrost on. You can post now and register later. Aux Fans: Vehicles equipped with Auxiliary fans. and when u purchase the fan kit or wiring kit they tune ⦠Dyno tests show a gain of up to 17 horsepower while also improving fuel economy by replacing your stock clutch fan assembly with this dual electric fan system. I then paid for a tune from an unnamed source that would activate them via a Nelson 05+ OEM fan harness and the 2 pins on the PCM. When all three relays are energized a, ground path is provided for the left cooling fan, as well as battery positive voltage to the right cooling fan – thus, during high speed operation both engine cooling fans have their own ground path, resulting in a parallel 12-volt. Im wanting to get all the wireing and relays for a stick looking intall, and I read that I could reprogram the computer to run them, so can I have it reprogram it before I install the fans? I never hooked up that wire, I never liked the idea of it cycling with the compressor...just might have to connect the pin 33 if it is doable since I can change the fan settings. × Since your truck didn't come with electrics you can either get an a/m temp sensor, use a relay tapped off of your a/c compressor or both. GM > System > Fans. Silikhan Publishing Group & SilveradoSS.com If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. Gallagher Marine Systems, Inc. (GMS) Profile. The fans do not come on and the high speed trigger ⦠Swapping the clutch fan for dual electric fans. Instagram @endlesswishlist6.0 https://www.instagram.com/endlesswishlist6.0/?hl=en Email inquiries to endlesswishlist@gmail.com Option #1 - triggering them off the A/C compressor relay. The clutch fan consumes energy constantly, whether engaged or not. The EFILive software tuning package has always fully supported efan programming; only recent versions of HPTuners (versions released after approximately April 2010?) Upload or insert images from URL. Pasted as rich text. have this capability. When the A/C refrigerant is not cooled it will over-pressurize until either (1) the built-in safety valve on the compressor vents-off the excess pressure to the atmosphere, and/or (2) one of the seals or hoses of the A/C system bursts. http://www.performancetrucks.net/forums/showthread.php?t=432250&highlight=2+pin+fan+harness&page=4. just measuse the rad. If you have a 2003+ truck, not only does it have a PCM with logic to fully control efan operation but also a pressure sensor on the A/C system - so the PCM is very aware of exactly what the pressure in the A/C system is at all times; this running pressure information is used to trigger the operation of the efans, and you can instruct the PCM exactly what pressures will turn the fans on & off using EFILive or HPTuners tuning software. So if you have the smaller one, you need to upgrade your radiator first. I have an '04 Suburban amd would like to convert the factory clutch fan to the factory dual electric fans on the '05 trucks (I have an '05 GMC 1500 with these fans) I am wanting to do this as factory as possible, that is, using factory components and wiring. During high speed operation, the PCM also supplies a ground path for the high speed fan relay via the blue, relay trigger wire (in addition to the low-speed green trigger wire). Also interested in hearing about other ⦠If anyone is interested in doing this I suggest going with PCMofNC.com they sell the fan kit wiring harness, electric fans ,etc. IMO connecting it to pin 33 is the way to go. Free shipping on many items ... 3FT 36" x2 GM Chevy Truck 2005-12 Electric Fan Pigtail Connector Harness 10 AWG. Environmental-expert.com Gallagher Marine Systems, Inc. (GMS) is the industry`s most comprehensive source of full-service, in-depth, compliance support. first. Get the best deals on Cooling Fans & Kits for Chevrolet Silverado 1500 when you shop the largest online selection at eBay.com. This Flex-a-lite #282 Chevy Truck fan is built for the demands of a truck. Chevy Silverado 2002, Trimline Reversible Electric Fan by Flex-a-Lite®. mine.that definetly made us all say wtf, which is why i have a switch to turn on my fan on high on the passenger side. I took a phone call from a customer that suffered an expensive setback with his truck, he purchased and properly installed a Torrent E-Fan kit on his 2004 Silverado SS, and then took his truck to a local performance shop to program the PCM to operate the efans; the failure was that the tuner was using an older copy ⦠That would be a great idea for Delphi to include in their PCM/ECM OS's - but they didn't, there is no software pressure over-protection logic in the PCM. No Fans: Vehicle is equipped with no fans. All wire is txl rated, the highest heat resistant covering available; used due to the high temps underhood. Number of Fans Fitted: Number of engine cooling fans fitted to the vehicle. ⦠didn fans programing electric wiring myself custom aftermarket performance sell temp available stick sensor trans actually install black since first doing system control turn tune both read, Users browsing this forum: No registered users and 4 guests. I think both fans run all the time but would need to double check. NOTE: Fan codes P0480, p0481, and p0483 need to be disabled in your tune for the fan switch, and set to NO ERROR REPORTING. The electric fans use no energy when they are off (a typical operating condition). I run lt1 fans on my 99 silverado ⦠And we can provide you with an unmatched blend of practical field experience and regulatory compliance expertise. first. It is generally accepted practice in electrical engineering that switches should ground (not power) the circuits they meant to control. I thought the safety blow-off valve was secondary protection in the event of a pressure switch failure. From The Manual - The Nelson Performance harness does use 3 relays, but IS NOT designed this way: speed relay trigger wire (green wire); this closes the low speed fan relay contacts, and positive battery voltage is, supplied from the low fan fuse to the left cooling fan - the return path for the left cooling fan is through the, single-pole relay and thusly the right-hand cooling fan, the result of which is a series circuit of doubled. So on the relay that triggers the high speed I would change it to trigger negative. This is a direct-fit, bolt-on Flex-A-Lite® dual electric-fan system for new body style 2000-2004 Chevrolet and GMC trucks with 27 ½ inch wide radiator core. I took a phone call from a customer that suffered an expensive setback with his truck, he purchased and properly installed a Torrent E-Fan kit on his 2004 Silverado SS, and then took his truck to a local performance shop to program the PCM to operate the efans; the failure was that the tuner was using an older copy of HPTuners, an earlier version of the software that does not support updating the A/C pressure set-points in the PCM - the result was that the efans would turn on when the engine got hot, but not always when the A/C compressor was running and this required complete A/C system repair when his compressor burned-up. ... And installing the fans without a tune ⦠If you have an account, sign in now to post with your account. It cycles when the pressure or temp reaches the set point that I tuned into the PCM. Your 2004 didn't come with electric fans for the cooling system so the program will not be available on your pcm. Is this possible? This is very important follow-up information for those working on their cooling systems, and/or replacing their clutch fans with electric fans - in short: YOU MUST MAKE SURE WHEN THE A/C IS "ON", AIR IS MOVING THROUGH THE CONDENSER/RADIATOR - IF NOT, THE A/C COMPRESSOR WILL VENT REFRIGERANT AND THEN SEIZE - THIS WILL REQUIRE MAJOR SERVICE AND EXPENSE TO REPAIR. Limitations of Some Tuning Software Packages. Steve, it has three relays, one triggered by the PCM for low speed (6v) and the other is triggered by a 12v source, giving 12v to the fans running them at 'high.' pulley and will program your pcm to turn on and off the e-fans. Im looking at an electric fan conversion package. If you are choosing to have us tune your PCM, please send ⦠After that you'll need a tune which Justin at Blackbear does for a very reasonable price. Electric Cooling fans staying ON when Engine is OFF. The holes for the fan to bolt on are already in the ⦠Installation. pulley and will program your pcm to turn on and off the e-fans. Make sure your tuning software allows you to input not only the desired engine coolant temperature 'set points', but ALSO the A/C system pressure set-points as well - this will guarantee that the efans are running when the A/C is on no matter how hot/cold the engine is. The A/C compressor in contemporary vehicle climate control systems is active much of the time, more than just when you desire cold air - the A/C is also "on" when defrosting windows in the winter, because A/C pulls the moisture out of the vehicle cab. I cannot comment, because I have never seen a Nelson harness - I know they are designed very different from the OEM 'series/parallel' setup. Our manual fan switch is also available for purchase with this kit. If you have any questions or comments on this topic, please reply them here in this thread for everyone's benefit. Also black bear performance sell a wiring kit with and without the alt. As a direct bolt-on electric fan kit for many of the 2000-2004 Chevy and GMC trucks with 34â radiator cores, this fan is the answer to the overheating problems caused by slow, inner city driving, and can solve the cooling problems that occur with body lifts. Scan Cable Tune Our scan cable tune is a step above the standard traditional tune that is prevalent throughout. How the PCMs pins 33 and 42 work, keep this in mind when designing your own efan control harness: operate at low speed; ground both the green and blue wires together and the efans run at high speed. Click Here for more info on our electric fan ⦠Your previous content has been restored. × Paste as plain text instead, × If you add fans, we'd be more than willing to create a custom tune for you to enable them and allow the pcm to control them as if it were factory equipped, like we have done for countless ⦠zacharyh687 wrote:you could do what he said^^ Also you could get you a efan from a ls1 powered camaro or corvette and modify the fan to fit on your truck and have a custom tune made that you can have the computer control the fans both high and low.. most mail order tuners like black bear, pcms for less, and wait for me can do the custom tune ⦠and they can also do a custom tune. resistance and both fans sharing 12-volt power and running at low speed. The radiator used with electric fans is thicker, adding to the capacity. In this second case, the person lost his A/C compressor completely. Specializing in LS tuning and installation. I do not see anything false about that advertising. That would be a great idea for Delphi to include in their PCM/ECM OS's - but they didn't, there is no software pressure over-protection logic in the PCM. If the vehicle is factory equipped with electric fans, the tool allows you to control them. just measuse the rad. Basically any 93-02 camaron/trans-am electric fans will work. 541 Cobblestone Road, Aurora, Ohio, 44202 USA (330) 626-9334 info@mrk-motorsports.com Mon-Fri: ⦠Chevy OEM Electric Dual Fan Relay Assembly. We will do this for free if you send in your ECM. When the A/C system is overheated and pushed to ultimate duress, the A/C compressor can seize or burn-up; if you are fortunate enough to catch the problem as it is happening you might be able to disable the A/C before causing permanent damage the compressor and rest of the system. Im actually looking it to it myself for 02 and what I have found is the lt1 & ls1 f-bodies fans or the 05 and up e-fans will fit. Wiring. Keep in, mind that the efans operate completely independent of any other electrical system in the vehicle since they are, on their own circuit; even if the ignition key is off and removed from the steering column the efans will. You cannot paste images directly. Ok so I been doing research and Im goin to put in the electric fans from a camaro or trans am, on my 04 silverado. Yes, the fan setting can be enabled via a custom tune, and I can adjust the temps for the fan on/off temps... there are no fan settings for a/c pressure... it's just enable e-fans, and adjust on/off temps for the fans to run.. that's it.. Depending on how your aftermarket electric fans are controlled, you have two options to make sure they will move air when the A/C is operating. Also black bear performance sell a wiring kit with and without the alt. The A/C trigger wire is a 12v reference and if you pin it to the PCM you might end up frying the Efan circuits in the PCM. 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