Alvin

iTrader: (2)

I'm not sure what the hell I'm doing wrong on this one

I can turn off the fans individually using bidi controls so I know they are commanding on/off as they should. I have tried everything under the sun. Its like something else is requesting fans (DTC, trans temp, etc)

Anyone have any tips?

LABELS Fan #1 Turn-on Delay
Parameters Value
{G1203} Type Of Fans Fitted To vehicle Series Parallel Fans
{G0901} Fan #1 Turn-on Temp 226.414063 °F
{G0902} Fan #1 Turn-off Temp 219.171875 °F
{G0903} Fan #1 Turn-on By A/C Temp 32.000000 °F
{G0904} Fan #1 Turn-off Speed 35.000000 MPH
{G0905} Fan #1 Turn-on Speed 30.000000 MPH
{G0906} Fan #1 Turn-on Delay 0.100000 Seconds
{G0907} Fan #1 Turn-off Delay 1.000000 Seconds
{G0908} Fan #1 Minimum On-Time 50.000000 Seconds
{G0909} Fan #1 Run-on temp 235.414063 °F
{G0910} Fan #1 Run-on time 150.000000 Seconds
{G0911} Fan #1 A/C Pressure Enable 215.039063 PSI
{G0912} Fan #1 A/C Pressure Disable 190.039063 PSI
{G0913} Fan #2 Turn-on Temp 233.585938 °F
{G0914} Fan #2 Turn-off Temp 227.328125 °F
{G0915} Fan #2 Turn-on Delay 1.000000 Seconds
{G0916} Fan #2 Turn-off Delay 1.000000 Seconds
{G0917} Fan #2 Minimum On-Time 30.000000 Seconds
{G0918} Fan #2 A/C Pressure Enable 248.046875 PSI
{G0919} Fan #2 A/C Pressure Disable 208.007813 PSI
{G0920} Fan#1 and #2 Both Off 65.000000 MPH




LABELS A/C Disable RPM
Parameters Value
{G0101} A/C Disable RPM 5250.000000 RPM
{G0102} A/C Enable RPM 5000.000000 RPM
{G0103} A/C Disable TPS 100.000000 %
{G0104} A/C Enable TPS 0.000000 %
{G0105} A/C Enable Timer 0.000000 Seconds
{G0106} A/C Auto Recirculation Fan #2 Control

BlackGMC

iTrader: (31)

Here are my settings... I am wondering if {G0903} Fan #1 Turn-on By A/C Temp 32.000000 °F is causing your issues... BTW are you using dual PCM pins?

LABELS Type Of Fans Fitted To vehicle
Parameters Value
{G1203} Type Of Fans Fitted To vehicle Series Parallel Fans
{G0901} Fan #1 Turn-on Temp 197.023438 °F
{G0902} Fan #1 Turn-off Temp 194.984375 °F
{G0903} Fan #1 Turn-on By A/C Temp 220.015625 °F
{G0904} Fan #1 Turn-off Speed 45.000000 MPH
{G0905} Fan #1 Turn-on Speed 42.000000 MPH
{G0906} Fan #1 Turn-on Delay 5.000000 Seconds
{G0907} Fan #1 Turn-off Delay 0.000000 Seconds
{G0908} Fan #1 Minimum On-Time 30.000000 Seconds
{G0909} Fan #1 Run-on temp 199.976563 °F
{G0910} Fan #1 Run-on time 204.793750 Seconds
{G0911} Fan #1 A/C Pressure Enable 1378.951817 kPa
{G0912} Fan #1 A/C Pressure Disable 861.844886 kPa
{G0913} Fan #2 Turn-on Temp 203.000000 °F
{G0914} Fan #2 Turn-off Temp 201.031250 °F
{G0915} Fan #2 Turn-on Delay 10.000000 Seconds
{G0916} Fan #2 Turn-off Delay 0.000000 Seconds
{G0917} Fan #2 Minimum On-Time 30.000000 Seconds
{G0918} Fan #2 A/C Pressure Enable 1723.689772 kPa
{G0919} Fan #2 A/C Pressure Disable 1385.684980 kPa
{G0920} Fan#1 and #2 Both Off 46.000000 MPH

Alvin

iTrader: (2)

Yeah, I sure am, by setting the auto recir to fan 2 control.

I tried moving 32 degrees up to 220 and no help. Truck is only running mid 190's .

BlackGMC

iTrader: (31)

Are both fans running on High or low, 1 fan or both? Also you could try logging your AC pressures to see if they are the reason the fans are activating....

Alvin

iTrader: (2)

I'll do that.. Now that you mention it this truck had a AC service not long ago. Maybe they over serviced it.

I'm using blue 42, red 33 with red 33 removed and the auto recirc turned to #2 fan control.

Alvin

iTrader: (2)

I'll do that.. Now that you mention it this truck had a AC service not long ago. Maybe they over serviced it.

I'm using blue 42, red 33 with red 33 removed and the auto recirc turned to #2 fan control.

BlackGMC

iTrader: (31)

That is way i have setup mine and others... So it should work..

Alvin

iTrader: (2)

I should say only fan 1 is running constantly. Fan 2 is quiet

Alvin

iTrader: (2)

Checked AC pressure. About 100psi high and low with it off. So that shouldn't be the reasonwhy its commanding on.

Also tried another computer.. same

I'm really at a loss with it. The only way I can get the fans not to come on is select "no fans" but then of course they don't run when they need to!

Alvin

iTrader: (2)

Update, Went to a 2002 OS and she works fine.. Go figure?