I have a 2004 Silverado and replaced the 28" Radiator with a 34" unit and added the OEM electric fans from a 2005+ Silverado. 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. 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. Tuning. The holes for the fan to bolt on are already in the … We will do this for free if you send in your ECM. And we can provide you with an unmatched blend of practical field experience and regulatory compliance expertise. 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. The fans do not come on and the high speed trigger … When the PCM triggers the two additional relays, the same voltage flows through each electric fan motor. Specializing in LS tuning and installation. Our manual fan switch is also available for purchase with this kit. GM > System > Fans. Swapping the clutch fan for dual electric fans. The 05-06 Tahoe/Silverado electric fans can only be used if you have the larger radiator. and they can also do a custom tune. Series/Parallel: Vehicle is equipped with relay controlled series/parallel fans. (when) I pull it off i'll change the wires and bench test it so I dont fry my PCM. So if you have the smaller one, you need to upgrade your radiator first. 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. 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. Another says that the electric fans use energy as well, so likely no gain vs clutch. 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. No Fans: Vehicle is equipped with no fans. Free shipping on many items ... 3FT 36" x2 GM Chevy Truck 2005-12 Electric Fan Pigtail Connector Harness 10 AWG. Option #1 - triggering them off the A/C compressor relay. Instagram @endlesswishlist6.0 https://www.instagram.com/endlesswishlist6.0/?hl=en Email inquiries to endlesswishlist@gmail.com So if you have the smaller one, you need to upgrade your radiator first. 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. My setup doesn't cycle with the compressor with Ac on or defrost on. If anyone is interested in doing this I suggest going with PCMofNC.com they sell the fan kit wiring harness, electric fans ,etc. Yea, I am aware; however my comment is not PCM / software related. 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). IMO connecting it to pin 33 is the way to go. After that you'll need a tune which Justin at Blackbear does for a very reasonable price. The clutch fan consumes energy constantly, whether engaged or not. have this capability. pulley and will program your pcm to turn on and off the e-fans. I cannot comment, because I have never seen a Nelson harness - I know they are designed very different from the OEM 'series/parallel' setup. Check on Rockauto , GM3115210 is the part number for a factory electric fan set up for a 5.3L or a 6.2L. 30 sold. In this way the electric fan motors are wired in parallel, causing the fan motors to spin at … I wonder if it would change any of the other wires, I'll print both diagrams and look at them next to each other. This Flex-a-lite #282 Chevy Truck fan is built for the demands of a truck. The PCM does not supply 12v + to the relays; exactly the opposite, it grounds relays. 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. continue to run if the green and/or blue wires are grounded. You have to rewire the nelson harness to work with the PCM. 2 Fans: Vehicles equipped with 2 fans. You can post now and register later. Paste as plain text instead, × After you get those, it's as simple as buying a wiring harness sold by [email protected],Nelson Performance, Rat Ron, etc. 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. Scan Cable Tune Our scan cable tune is a step above the standard traditional tune that is prevalent throughout. I run lt1 fans on my 99 silverado … Electric Cooling fans staying ON when Engine is OFF. The EFILive software tuning package has always fully supported efan programming; only recent versions of HPTuners (versions released after approximately April 2010?) 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. Gallagher Marine Systems, Inc. (GMS) Profile. 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. The 05-06 Tahoe/Silverado electric fans can only be used if you have the larger radiator. Option #2 - program the PCM to turn on the Efans when the A/C is on. 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). 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. Update on the 01-05 electric fan conversion. If you are choosing to have us tune your PCM, please send … If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. Silikhan Publishing Group & SilveradoSS.com 2007 Chevy Silverado 1500 Pickup RADIATOR COOLING FAN … NOTE: Fan codes P0480, p0481, and p0483 need to be disabled in your tune for the fan switch, and set to NO ERROR REPORTING. If you have an account, sign in now to post with your account. Regardless, the fans should be on whenever the A/C is on.   Your previous content has been restored. Display as a link instead, × â€¦ Im looking at an electric fan conversion package. 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. I thought the safety blow-off valve was secondary protection in the event of a pressure switch failure. 541 Cobblestone Road, Aurora, Ohio, 44202 USA (330) 626-9334 info@mrk-motorsports.com Mon-Fri: …   You cannot paste images directly. Basically any 93-02 camaron/trans-am electric fans will work. It cycles when the pressure or temp reaches the set point that I tuned into the PCM. first. 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.' 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. Limitations of Some Tuning Software Packages. and they can also do a custom tune. Fan Type. As opposed to a clutch fan that is running at all times just at different speeds. Chevy Silverado 2002, Trimline Reversible Electric Fan by Flex-a-Lite®. 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? 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. 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 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. Get the best deals on Cooling Fans & Kits for Chevrolet Silverado 1500 when you shop the largest online selection at eBay.com. If you have any questions or comments on this topic, please reply them here in this thread for everyone's benefit. This helped with voltage drop with stereo and HIDS on at night at idle alot. 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. Aux Fans: Vehicles equipped with Auxiliary fans. resistance and both fans sharing 12-volt power and running at low speed. Installation. $35.95. 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. If your truck did not come with cooling fans tuning the PCM for fans is REQUIRED. Click Here for electric fan patch information. The holes for the fan to bolt on are already in the … 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. The electric fans use no energy when they are off (a typical operating condition). 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 … Also black bear performance sell a wiring kit with and without the alt. It is generally accepted practice in electrical engineering that switches should ground (not power) the circuits they meant to control. If you have the 34 inch radiator, like I do, the fans will bolt right up as if they were made for your truck. Also black bear performance sell a wiring kit with and without the alt. 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. The Trimline electric fans can be used as a primary fan or an auxiliary fan. 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. × just measuse the rad. All wire is txl rated, the highest heat resistant covering available; used due to the high temps underhood. 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. 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 try my best to give a tutorial on how I installed a electric fan onto my 2002 Silverado. Wiring. In this second case, the person lost his A/C compressor completely. 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. 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? 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. Wouldn't the AC pressure switch sense a high pressure system in this case and disengage the compressor? My comment is not PCM / software related provide you with an blend. Is also available for purchase with this kit yea, i am aware ; however my comment is not /. 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