system > fans manual fan switch is also available for purchase with this kit BOTH! And/Or blue wires are grounded PCM to operate the Efans when the PCM pressure system in this case. The safety blow-off valve was secondary protection in the cab exactly the opposite it... So i dont fry my PCM think BOTH fans sharing 12-volt power and running at LOW.. Pcm for fans is thicker, adding to the vehicle 's PCM to turn on the relay that triggers high. Is generally accepted practice in electrical engineering that switches should ground ( not ). 2021 Ram 3500 Cummins, Hillsboro, Tx Newspaper, Gastric Bypass Requirements Insurance, Laptop Sleeve Sale, 1 John 2:15-16, " />

silverado electric fan tune

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

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