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Cooling fan activation

Posted: Sun Feb 04, 2018 1:56 pm
by lastcall190
Quick question. Anyone know off hand the temp at which the fans kick on with a stock tune? Thanks

-J

Re: Cooling fan activation

Posted: Sun Feb 04, 2018 2:19 pm
by smwalker
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11-13 diagram:
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Diagram Link

Re: Cooling fan activation

Posted: Sun Feb 04, 2018 3:53 pm
by lastcall190
Huge help. Thank you

-J

Re: Cooling fan activation

Posted: Sat Apr 07, 2018 8:06 pm
by Sanford
I would like to thank Steve for posting the strategy of the radiator cooling fan operation. I am slowly working out of bugs on the last 2011 that I picked up. After I recharged the AC from swapping cams, I noticed that the fans ran at a lot faster speed than the first one I picked up. I popped the hood and started the troubleshooting and I noticed only one fan was running. I would hate to hear the air noise that both of them running on high speed. After read Steve's post, it was obvious that the one fan not running was open, which prevented both fans from running on low speed and the head pressure was getting high enough to switch the fans to high speed. Installed 2 new GM motors and now they act and sound like fans on the wife's car.

David

Re: Cooling fan activation

Posted: Fri Jun 19, 2020 7:45 pm
by smwalker
This topic came up again today and realized I did not have the 14+ info in here:

Huh they do not give temperature point on and off levels on the WN's. Just variable just does what ever it needs to do to keep it in a temp zone I guess.
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Re: Cooling fan activation

Posted: Thu Jun 25, 2020 6:58 am
by BigBen 6.0
Any chance someone can get a picture of the wires going into a 14+ control module. Long story but I am fixing a wrecked car and the box was damaged, wires got switched(my fault, oops) that's what the picture is for, thought I switched them back right but even after replacing the control module still no fans. If my wires are all in the correct position, any suggestions on what else it could be? Main power to the fans is working, tested that already. Is the white/black wire an activation for the fans, if so is it a + or - signal? Any tips or ideas would be much appreciated.

Re: Cooling fan activation

Posted: Thu Jun 25, 2020 9:29 am
by smwalker
Here are the relevant symbol descriptions. I am not sure what that means though.
There is a pull down resistor in the ECM. I would assume that pulls down a voltage with a ground so that means a positive voltage is sent to the fan module and the module turns that voltage level into a predetermined duty cycle for pulse width modulation of the fan speed.
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