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    It’s 5 and a half years old with 27k so that...

    It’s 5 and a half years old with 27k so that would make sense
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    2015 Yukon 6.2L coolant temps?

    I?m trying to write a custom fan tune for a 3.6 v6 so bare with me.

    I checked out the factory tune for my 2015 Yukon Denali 6.2l and I get that it has a thermostat that cracks opens at 194 and is...
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    The scanner will not turn them on. Also, when...

    The scanner will not turn them on. Also, when they are on, the scanner shows off.
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    I will try changinig 18046 to having “1” all the...

    I will try changinig 18046 to having “1” all the way across. It is currently 0 1 0 1 0
    I’m not sure why I would need to change it from stock. Since it is supposed to be the table that says “turn on...
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    The fan does not work when I click “on” in the...

    The fan does not work when I click “on” in the scanner controls. Nor does it show “on” when it’s on in the scanner pids
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    Oem is a pwm ev... factory harness is 3 wires....

    Oem is a pwm ev... factory harness is 3 wires. +/- and a signal. So spal and others said to use the white wire in the fan for signal.
    Tune is still pwm ev and 100hz (spal said that is fine)
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    So if the truck only has 1 fan....(oem was a...

    So if the truck only has 1 fan....(oem was a single fan and I’ve replaced it with a single spal fan)... so I’ve had to reverse all the % numbers.

    I’m reading your post and trying to sort through...
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    Changed the fan speed a bit to help keep things...

    Changed the fan speed a bit to help keep things cooler. And adjusted the ECM graph 18040- "Fan State Transition Desired % vs, Current State" to:


    0->1 77
    1->2 65
    2->3 54
    3->4 41
    1->0 79
    2->1...
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    I reversed The fan state transition desired % vs...

    I reversed The fan state transition desired % vs current state Numbers
    So now they read:
    Fan desired
    0->1 45
    1->2 30
    2->3 20
    3->4 10
    1->0 48
    2->1 36
    3->2 24
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    So it is a 3 speed controller? Does it get its...

    So it is a 3 speed controller? Does it get its signal from the ecu or a seperate temp sensor?
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    Details for Fan graphs boxes on genv

    Hi,

    The hptuner info page on fans doesn?t really explain, or doesn?t even list, a lot of the boxes and graphs in the fan part of the genv gm tune... (v8 and v6 are the same I believe.

    I?m...
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    103620103621 I "believe" the fan is running...

    103620103621

    I "believe" the fan is running when driving according to ect temp. However when I have the scanner running, the fan pid never shows on, its always off. Also when I turn the ac on the...
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    Pm sent

    Pm sent
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    Sticky: This may sound silly to all the experts here......

    This may sound silly to all the experts here... but I’ve been tossed into the deep end with this whole custom fan thing on my genv gm ecu.

    When I update the hptuner editor/scanner to the current...
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    Yes. But mine looks a bit different. I will try...

    Yes. But mine looks a bit different. I will try to post a pic of it in the morning
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    I tried that. I couldn’t get the scanner to turn...

    I tried that. I couldn’t get the scanner to turn the fan on. Started at 1% and went up to about 40% and it never turned on.

    So I did about 5 “tunes” lol. I know I have my low number right (the 85)...
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    Awesome. So reverse the desired % and desired %...

    Awesome. So reverse the desired % and desired % vs ac and the fans work. I am just trying to find out why the ac and defrost don’t turn the fan on when the buttons on the dash are pressed.
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    I tried 91 and they would not turn on. I watched...

    I tried 91 and they would not turn on. I watched the scanner and the temp at which the fans finally turned in and it it was the temp where 85 was the %

    Before I reversed the ect desired % boxes....
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    Update, I repinned the Spal fan and have the...

    Update, I repinned the Spal fan and have the factory harness signal going to the spal white wire. The hptuner tune is still at pwm ev and 100hz.... I did reverse the two "controlled by %" boxes:...
  20. Ive jumped into most of Blindsquirrels posts...

    Ive jumped into most of Blindsquirrels posts trying to get my spal brushless fan to work on my 2018 Chevy colorado...but this thread has me thinking of a new question that maybe chris can answer....
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    So tried the green signal wire from the ecu to...

    So tried the green signal wire from the ecu to the white signal wire on the spal fan and leaving the yellow wire on the spal fan open.

    Nothing happened. Tried the ac, defrost and ran it to 223?...
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    Found the following on the factory manual. Maybe...

    Found the following on the factory manual. Maybe someone who knows what the spal fans need in the terms of signal can help me with the tune. The factory fan is also a pwm ev which I can confirm is...
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    I need to figure out what signal the spal fan is...

    I need to figure out what signal the spal fan is looking for on the white wire and yellow wire...and then what signal the Gm ecu is putting out on that green wire.

    And then find out if I can get...
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    So far no fan when ac or defrost kicks in....

    So far no fan when ac or defrost kicks in.
    Waiting for water temp. Still only up to 212
    I think stock tune doesn’t turn on until 221 which seems high but it’s what was in the tune


    I got up to...
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    So theoretically I can run red to red, black to...

    So theoretically I can run red to red, black to black and the oem green (it’s actually green/white) to the spal white... and leave the spal yellow unused?

    The factory manual says black ground, red...
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