I thought the safety blow-off valve was secondary protection in the event of a pressure switch failure. Get the best deals on Cooling Fans & Kits for Chevrolet Silverado 1500 when you shop the largest online selection at eBay.com. 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. The fans do not come on and the high speed trigger … So if you have the smaller one, you need to upgrade your radiator first. So if you have the smaller one, you need to upgrade your radiator first. Chevy OEM Electric Dual Fan Relay Assembly. 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. 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. 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. And we can provide you with an unmatched blend of practical field experience and regulatory compliance expertise. Specializing in LS tuning and installation. The Trimline electric fans can be used as a primary fan or an auxiliary fan. Clear editor. 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.' You can set the temps and pressures for the fans to suit your climate and also control how the fans come on. The electric fans use no energy when they are off (a typical operating condition). 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. 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. continue to run if the green and/or blue wires are grounded.   Your previous content has been restored. Free shipping on many items ... 3FT 36" x2 GM Chevy Truck 2005-12 Electric Fan Pigtail Connector Harness 10 AWG. I HIGHLY recommend programming the A/C pressure set-points in the vehicle's PCM to operate the efans when the PCM supports it. 2 Fans: Vehicles equipped with 2 fans. 2007 Chevy Silverado 1500 Pickup RADIATOR COOLING FAN … 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 … 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). Yea, I am aware; however my comment is not PCM / software related. Fan Type. Tuning. pulley and will program your pcm to turn on and off the e-fans. 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. 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? 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 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 … The only hard part looks like a ~36 mm bolt. circuit with both fans running at maximum speed. I have been considering doing that myself. 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 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. No Fans: Vehicle is equipped with no fans. The holes for the fan to bolt on are already in the … 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. I wonder if it would change any of the other wires, I'll print both diagrams and look at them next to each other. 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 … At an electric fan by Flex-a-Lite® so likely no gain vs clutch of fans Fitted to the capacity free... Bear performance sell a wiring kit with and without the alt regulatory compliance expertise is independent of PCM! 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