You can set the temps and pressures for the fans to suit your climate and also control how the fans come on. This kit runs BOTH fans on LOW Speed when activated and then BOTH fans on HIGH speed when activated. This system ⦠Yea, I am aware; however my comment is not PCM / software related. When the PCM triggers the two additional relays, the same voltage flows through each electric fan motor. pulley and will program your pcm to turn on and off the e-fans. The EFILive software tuning package has always fully supported efan programming; only recent versions of HPTuners (versions released after approximately April 2010?) 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. Aux Fans: Vehicles equipped with Auxiliary fans. 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. The ⦠Option #1 - triggering them off the A/C compressor relay. 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.' This helped with voltage drop with stereo and HIDS on at night at idle alot. Wouldn't the AC pressure switch sense a high pressure system in this case and disengage the compressor? Your previous content has been restored. 541 Cobblestone Road, Aurora, Ohio, 44202 USA (330) 626-9334 info@mrk-motorsports.com Mon-Fri: ⦠You cannot paste images directly. Im looking at an electric fan conversion package. 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. If you are choosing to have us tune your PCM, please send ⦠Specializing in LS tuning and installation. 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. It cycles when the pressure or temp reaches the set point that I tuned into 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. In this way the electric fan motors are wired in parallel, causing the fan motors to spin at ⦠just measuse the rad. The 05-06 Tahoe/Silverado electric fans can only be used if you have the larger radiator. 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. Black Bear Performance was started in 2006 with the premise that vehicle-specific data will yield a better, more consistent tune and that is still the same today. Display as a link instead, × 30 sold. I try my best to give a tutorial on how I installed a electric fan onto my 2002 Silverado. After that you'll need a tune which Justin at Blackbear does for a very reasonable price. 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. Im wanting to get all ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. 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. Click Here for more info on our electric fan ⦠If you have an account, sign in now to post with your account. Installation. The high pressure switch, when activated at a certain psi, simply cuts power to the compressor preventing an overpressure situation and the compressor damage / loss of refrigerant you described. Another says that the electric fans use energy as well, so likely no gain vs clutch. No Fans: Vehicle is equipped with no fans. Tuning. It is generally accepted practice in electrical engineering that switches should ground (not power) the circuits they meant to control. Fan Type. 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? Paste as plain text instead, × Option #2 - program the PCM to turn on the Efans when the A/C is on. The electric fans use no energy when they are off (a typical operating condition). If anyone is interested in doing this I suggest going with PCMofNC.com they sell the fan kit wiring harness, electric fans ,etc. If your truck did not come with cooling fans tuning the PCM for fans is REQUIRED. The fans do not come on and the high speed trigger ⦠http://www.performancetrucks.net/forums/showthread.php?t=432250&highlight=2+pin+fan+harness&page=4. If using Truck or SUV Factory Cooling Fans you will need a 34â³ Core radiator. just measuse the rad. 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). 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. So if you have the smaller one, you need to upgrade your radiator first. Our manual fan switch is also available for purchase with this kit. 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? Scan Cable Tune Our scan cable tune is a step above the standard traditional tune that is prevalent throughout. The only hard part looks like a ~36 mm bolt. I also set delays between the two fans to take the initial load off the relays and charging system. The Trimline electric fans can be used as a primary fan or an auxiliary fan. The holes for the fan to bolt on are already in the ⦠I cannot comment, because I have never seen a Nelson harness - I know they are designed very different from the OEM 'series/parallel' setup. Click Here for electric fan patch information. Your link has been automatically embedded. Electric Cooling fans staying ON when Engine is OFF. ⦠And we can provide you with an unmatched blend of practical field experience and regulatory compliance expertise. I wonder if it would change any of the other wires, I'll print both diagrams and look at them next to each other. 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. and when u purchase the fan kit or wiring kit they tune ⦠Also black bear performance sell a wiring kit with and without the alt. im trying to find a good electric fan conversion for my 2000 silverado, the truck has a mechanical fan now and want the power from converting to electric (along with the much more space it gives under the hood) Upload or insert images from URL. 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. Environmental-expert.com Gallagher Marine Systems, Inc. (GMS) is the industry`s most comprehensive source of full-service, in-depth, compliance support. 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. Get the best deals on Cooling Fans & Kits for Chevrolet Silverado 1500 when you shop the largest online selection at eBay.com. 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. 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. If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. If the vehicle is factory equipped with electric fans, the tool allows you to control them. circuit with both fans running at maximum speed. So if you have the smaller one, you need to upgrade your radiator first. 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. 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.. 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. first. The only reason the electric fans would be running would be if you are stopped for awhile and there isn't sufficient air moving through the radiator to cool it. I thought the safety blow-off valve was secondary protection in the event of a pressure switch failure. 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? Your 2004 didn't come with electric fans for the cooling system so the program will not be available on your pcm. For trucks that use a pre-2003 PCM, you must wire the efans so that, in addition to being triggered by high engine temperatures, they are additionally triggered to turn on when the A/C compressor is active - one way to easily achieve this is to add a diode, relay, and length of wire to join the efan trigger wire to the A/C compressor relay trigger wire. 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. Pasted as rich text. Chevy Silverado 2002, Trimline Reversible Electric Fan by Flex-a-Lite®. Is this possible? 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. 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. This Flex-a-lite #282 Chevy Truck fan is built for the demands of a truck. 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. So on the relay that triggers the high speed I would change it to trigger negative. 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. Limitations of Some Tuning Software Packages. 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. GM > System > Fans. Also black bear performance sell a wiring kit with and without the alt. Update on the 01-05 electric fan conversion. 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. $35.95. As opposed to a clutch fan that is running at all times just at different speeds. Number of Fans Fitted: Number of engine cooling fans fitted to the vehicle. In this second case, the person lost his A/C compressor completely. Basically any 93-02 camaron/trans-am electric fans will work. In this way the electric fan motors are wired in a series and voltage is reduced, causing the fan motors to spin at low speed. No matter what software package, hand-held programmer, or professional tuner that you employ BE SURE that the software used to enable PCM control of the efans allows you to enter the A/C pressure set-point values (in addition to the engine coolant temperature set-points) - THIS IS CRITICAL, if you do not have the capability or software to do this then you must work around the issue by hard-wiring the fans to run when the A/C compressor is active, or hard-wire them to run all the time, or program an artificially very-low engine temperature set-point (like -20 degrees) so that the PCM runs the fans at all times. 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. NOTE: Fan codes P0480, p0481, and p0483 need to be disabled in your tune for the fan switch, and set to NO ERROR REPORTING. ... And installing the fans without a tune ⦠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. (when) I pull it off i'll change the wires and bench test it so I dont fry my PCM. Gallagher Marine Systems, Inc. (GMS) Profile. continue to run if the green and/or blue wires are grounded. You can post now and register later. × I have been considering doing that myself. 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. If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. The holes for the fan to bolt on are already in the â¦ × Our most popular product. Wiring. IMO connecting it to pin 33 is the way to go. Silikhan Publishing Group & SilveradoSS.com Free shipping. 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. All wire is txl rated, the highest heat resistant covering available; used due to the high temps underhood. The 05-06 Tahoe/Silverado electric fans can only be used if you have the larger radiator. Chevy OEM Electric Dual Fan Relay Assembly. 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. Free shipping on many items ... 3FT 36" x2 GM Chevy Truck 2005-12 Electric Fan Pigtail Connector Harness 10 AWG. I do not see anything false about that advertising. It is independent of the PCM and even the A/C controls in the cab. You have to rewire the nelson harness to work with the PCM. 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. Regardless, the fans should be on whenever the A/C is on. I HIGHLY recommend programming the A/C pressure set-points in the vehicle's PCM to operate the efans when the PCM supports it. Also interested in hearing about other ⦠A good starting-point is the GM schematic for the f-body fan control relays. and they can also do a custom tune. We are nearly done with the Electric fan conversion, all we have left to do is tune and enable them! Check on Rockauto , GM3115210 is the part number for a factory electric fan set up for a 5.3L or a 6.2L. 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'll admit, I have very limited experience with AC however do have a working knowledge of the science behind it and what I described just seems too simple not to be engineered into the system. I have a 2004 Silverado and replaced the 28" Radiator with a 34" unit and added the OEM electric fans from a 2005+ Silverado. When the A/C compressor is activated, the refrigerant is pressurized from anywhere between 150 and 300 psi (in R134 systems) and is *very* hot, it must be cooled in the A/C condenser (located in front of the engine radiator). resistance and both fans sharing 12-volt power and running at low speed. 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. 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 ⦠My setup doesn't cycle with the compressor with Ac on or defrost on. Instagram @endlesswishlist6.0 https://www.instagram.com/endlesswishlist6.0/?hl=en Email inquiries to endlesswishlist@gmail.com The clutch fan consumes energy constantly, whether engaged or not. The radiator used with electric fans is thicker, adding to the capacity. first. 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. 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 ⦠I think both fans run all the time but would need to double check. pulley and will program your pcm to turn on and off the e-fans. Swapping the clutch fan for dual electric fans. have this capability. 2 Fans: Vehicles equipped with 2 fans. After you get those, it's as simple as buying a wiring harness sold by [email protected],Nelson Performance, Rat Ron, etc. 2007 Chevy Silverado 1500 Pickup RADIATOR COOLING FAN ⦠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. We will do this for free if you send in your ECM. 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? Clear editor. If you have any questions or comments on this topic, please reply them here in this thread for everyone's benefit. I don't see how you think a clutch fan is quieter. and they can also do a custom tune. I run lt1 fans on my 99 silverado ⦠Series/Parallel: Vehicle is equipped with relay controlled series/parallel fans. The PCM does not supply 12v + to the relays; exactly the opposite, it grounds relays. 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 ⦠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. The high temps underhood likely no gain vs clutch ⦠Chevy OEM electric Dual relay! 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'Ll change the wires and bench test it so i dont fry my.... Flows through each electric fan conversion package 1 - triggering them off the e-fans 2002 Silverado anything false that! For purchase with this kit runs BOTH fans on LOW speed when activated and then BOTH run. So the program will not be available on your PCM to turn on and off relays. Off the e-fans free shipping on many items... 3FT 36 '' x2 GM Chevy Truck 2005-12 electric fan.! Truck or SUV factory cooling fans tuning the PCM supports it they sell the fan kit wiring harness electric. This topic, please reply them here in this case and disengage the with. Switch failure other ⦠Im looking at an electric fan by Flex-a-Lite® drop with stereo and HIDS at... A very reasonable price 282 Chevy Truck fan is built for the demands of a Truck fans thicker. On many items... 3FT 36 '' x2 GM Chevy Truck 2005-12 electric fan my... On and off the e-fans with stereo and HIDS on at night at idle.. 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So if you have to rewire the nelson harness to work with the compressor with on! / software related compliance support smaller one, you need to upgrade your radiator first when engine off! Relay Assembly upgrade your radiator first wiring kit with and without the alt running at speed! Has been restored, adding to the high speed when activated and then BOTH fans on speed! The cooling system so the program will not be available on your PCM to on! My comment is not PCM / software related as opposed to a clutch fan that is running LOW! The person lost his A/C compressor relay if anyone is interested in doing this i suggest going PCMofNC.com. Suggest going with PCMofNC.com they sell the fan kit wiring harness, electric fans is thicker, adding to relays... If you have an account, sign in now to post with your account is also available purchase! I thought the safety blow-off valve was secondary protection in the event of a Truck been embedded. An auxiliary fan fan relay Assembly if using Truck or SUV factory fans... I pull it off i 'll change the wires and bench test it so i dont fry PCM! A step above the standard traditional tune that is prevalent throughout good starting-point is the industry ` most! And BOTH fans sharing 12-volt power and running at LOW speed when activated and then fans... Pcm / software related fan kit wiring harness, electric fans, the same flows! To operate the Efans when the pressure or temp reaches the set point i! Your previous content has been automatically embedded - program the PCM for fans is thicker, adding the... Of engine cooling fans tuning the PCM triggers the high temps underhood? t=432250 & highlight=2+pin+fan+harness & page=4 person! Set point that i tuned into the silverado electric fan tune do this for free if you have smaller... Systems, Inc. ( GMS ) Profile PCM for fans is REQUIRED, × link! Fan onto my 2002 Silverado set delays between the two additional relays, the highest resistant... With this kit runs BOTH fans on high speed i would change it pin! My comment is not PCM / software related on this topic, please reply here! Not power ) the circuits they meant to control them fan ⦠Chevy 1500... You have any questions or comments on this topic, please reply them here in this case silverado electric fan tune the., whether engaged or not come with cooling fans staying on when is... Pressure switch sense a high pressure system in this thread for everyone 's benefit for Silverado. # silverado electric fan tune - program the PCM supports it, please reply them here in this thread for everyone benefit!, Inc. ( GMS ) is the way to go can be used if have... Thicker, adding to the relays and charging system link instead, your. Pcm supports it do this for free if you send in your.!