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Electric Fan Help
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All,
I am having issues getting my electric fans to work for my LS swap. I am running 2 14" fans with each having only a positive and a ground wire. I grounded the black wires to the radiator support, so I know that is not the issue. My programmer stated he set up the PCM for one fan to come on at 205 and the other at 210. Problem is only one comes on, and I have given the engine ample time to heat up. I have attached the 2 relay diagram to show how I hooked up the relays. I have also verified both fans work. I do not have a lot of wiring experience so any info is greatly appreciated. |
Re: Electric Fan Help
This is not exactly the way I would have wired them, but it should work. Is the temperature getting up to 210F, if so is the high speed wire from the PCM going to ground?
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Re: Electric Fan Help
I was going to say the same thing, if my engine is seeing 210F something is not working/flowing correctly or I loss some water. These engines seem to cool really fast once the fan is turned on...at least in my experience. I have both my fans hook to the PCM low speed wire and have never needed anything else in this Texas heat.
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Re: Electric Fan Help
What terminals are you using from the ECM?
If i remember right for single mode fan control you will use PIN 42 on the blue connector for fan 1 and PIN 33 on the red/green for fan2. |
Re: Electric Fan Help
I'm 99% certain the engine is reaching 210. The first fan kicks on and I continued to let the truck idle for an extended amount of time. I sent my harness out to have it cut down and it came back labeled with a green wire labeled main fan and a blue wire labeled aux fan. I believe the main fan relay is the one that is working. Not sure on what pins wires are coming from.
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Re: Electric Fan Help
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Re: Electric Fan Help
Interesting. My factory temp gauge does not seem to be too accurate,so was worried about not having both fans before driving. How long do you think I would have to drive to find out?
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Re: Electric Fan Help
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Re: Electric Fan Help
Good info, thanks! I will try to get my hands on a code reader.
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Re: Electric Fan Help
I also have the scanguageII for the RPM, MPH, Engine Temp and Air intake temp. Great tool for that. Look around for fan diagrams and you will find one with a 3 relay setup that will turn both fans on at low and high speed.
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Re: Electric Fan Help
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Re: Electric Fan Help
Jsett by looking at your drawing you need both terminal 85's of your relays controlled by pin 42 of the ecm. This will make both of them come on at high speed. Crash's diagram is set up to run both high and low speed fan modes in which you would have to add a relay. Based on your drawing I am assuming you are only looking for one mode?
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Re: Electric Fan Help
If you can set both fans to come on at 120 degrees in the PCM you can test your wiring for functionality. I prefer 200 and 205 for my fan settings. Higher and lower depending on how well they are shrouded and how well the engine bay breathes.
Once you know both are functional at 120 degrees, then you can set them up higher to their normal set points. |
Re: Electric Fan Help
Does kind of sound like fan 1 is cooling it enough that 2 isnt coming on. Try unhooking the first fan and see if the other one comes on.
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Re: Electric Fan Help
My second fan never comes on at crank up idle no matter how long it sits.
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Re: Electric Fan Help
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Try ls1nova71 idea above.. "-------------------------------------------------------------------------------- Does kind of sound like fan 1 is cooling it enough that 2 isnt coming on. Try unhooking the first fan and see if the other one comes on. " good luck |
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