Good vid except the green is actually low speed both fans (engine temp)..blue is high speed 1 fan (ac trigger)..both wires triggered =both fans on high for max cooling..
Your Pull a Part must be better than mine. I grabbed the fans and harness and they charged me $65 since they sell the harness separate. Heck, while looking online they have prices for airbags but you pull a steering wheel and the air bag and they take it since they have a deal worked out with a guy that buys them locally. Heck, any sets of wheels worth having they pull for sale or if they are aluminum they yank them and sell them to the recycle place as aluminum scrap. I snagged a set of aluminum rims off a AMG they hadn't been able to get off the car and I played hell getting them pointing out what the sits says and that I would call the corporation entity and report it. Instead of the quality grading they have listed on the site they made me pay the aluminum scrap value.
Thanks for the great video. You explain everything in the language of the average Joe. Haha! I have a 97 2D Tahoe, so this should work. Thanks, brother.
Great fan power video. I couldn’t find anything like this 5 years ago when I set up my system. Thanks for Showing the 1 fan on for low and 2 fans on for high. How does the factory setup run the fans when the AC is on? Does it energize just the low fan or both fans?
I kind of misspoke in the video. The low setting is both fans at half speed (6v per fan), high speed (12v per fan) is both fans at full speed (the 3 relays is what makes this possible). When testing the harness/fans like I did with 1 trigger wire at a time you get 1 fan/2 fans, but when installed on the vehicle you'll get both low or both high. When the AC is on the computer runs both fans at full speed if the AC fan settings are met, which is based on 30 MPH or less vehicle speed (some operating systems) and AC line pressure, typically enable at 220psi, disable at 150psi.
@@wilsworkshop The 3 relay setup I copied and built from a RU-vid video does the same. Power is sent through both fans at 1/2 speed for low and both at full speed for high speed. I’m still figuring out how my AC will work with the fans. I currently have a relay to turn on both fans at 1/2 speed whenever the AC switch is on, it’s not speed sensitive. I’m going to pick up a truck fan relay & harness the next time I go to the used OEM parts store (junkyard)!
Would like both an auto set up to turn on when temp sensor is hot . And a manual one when I feel like it cooling after shutting off car. 71 lemans , 350 Pontiac motor
It'll work with all of the gen 3 LS computers, 1999-2007, just need to make sure the electric fan settings are turned on in the tune, most earlier ones arent active from the factory since the majority used a mechanical fan.
Yep. The wiring is really basic for the fans and power. What you would need is a way to trigger the two ground wires that normally run to the computer. A cheap electric fan thermostat like you would use on an aftermarket fan would work. All the 2 wires need are a ground connection for the fan relays to switch on.
Usually yes it needs to be turned on, but I've seen some computers with the E-fans turned on but the truck equipped with a mechanical fan. The only way to know is to check the tune, which at that point you can just turn them on if you have the software to check it.
Sorta, the Red/Blue harness uses the Red 33 wire for the AC Clutch. If you're not using the AC Clutch wire, you can have the PCM reprogrammed to control a fan from that wire. If you are using the AC Clutch you need to figure a way around the issue with another relay.
