It seems that my cooling fans are running 100% of the time. Not an expert here but my understanding would be that it would only come on when needed per the parameters below vs running full time. It may be that I am hearing only fan #1 since it is fairly quiet. I can usually here my fuel pump whine really loud when fan #2 kicks in. Even on a cold start after a couple seconds I can here the fan come on with the coolant temperatures way below 82C. I am running stock fans with no recent changes

Any suggestions? Thanks

Here are my current settings:

{G1203} Type Of Fans Fitted To vehicle Series Parallel Fans
{G0901} Fan #1 Turn-on Temp 82.03125 °C
{G0902} Fan #1 Turn-off Temp 77.109375°C
{G0903} Fan #1 Turn-on By A/C Temp 84.804688°C
{G0904} Fan #1 Turn-off Speed 56.327057KMH
{G0905} Fan #1 Turn-on Speed 48.280335KMH
{G0906} Fan #1 Turn-on Delay 1Seconds
{G0907} Fan #1 Turn-off Delay 1Seconds
{G0908} Fan #1 Minimum On-Time 50Seconds
{G0909} Fan #1 Run-on temp 139.960938°C
{G0910} Fan #1 Run-on time 1Seconds
{G0911} Fan #1 A/C Pressure Enable 1516.308346kPa
{G0912} Fan #1 A/C Pressure Disable 1241.595289kPa
{G0913} Fan #2 Turn-on Temp 85.351563°C
{G0914} Fan #2 Turn-off Temp 79.84375 °C
{G0915} Fan #2 Turn-on Delay 0.4Seconds
{G0916} Fan #2 Turn-off Delay 0.6Seconds
{G0917} Fan #2 Minimum On-Time 26Seconds
{G0918} Fan #2 A/C Pressure Enable 1758.70222kPa
{G0919} Fan #2 A/C Pressure Disable 1516.308346kPa
{G0920} Fan#1 and #2 Both Off 144.841005KMH

Thanks Again!!!

 

Is the light for the A/C on? That will run the fans full time...

 

In fact, I think I read that the A/C only runs one fan, at low speed, until a specific temperature is reached. Sounds like a match for your situation.

 

Thanks for the ideas...unfortunately, the A/C was off and has not been used for some time. I have not been using the A/C since it is in need of a 134 re-charge

I am thinking that my ground wire may have a short somewhere and therefore completing the circuit or that I may have a bad relay. I plan on doing some continuity & short testing of the wiring harness.

Any other ideas! Thanks for the help

 

Odd that it doesn't run as soon as you turn the key - that would
point toward a stuck relay or a short of some sort. The only
other way that relay could come is if the return from the solenoid
is somehow grounded when it shouldn't be...

 

Cooling Fan Always On
Step
Action
Yes
No

Schematic Reference: Engine Cooling Schematics

DEFINITION: One or both engine cooling fan motors run continuously in high or low speed.

1
Did you perform the Engine Cooling Diagnostic System Check?
Go to Step 2
Go To Diagnostic System Check - Engine Cooling

2
Turn ON the ignition, with the engine OFF.

Are one or both cooling fans ON?
Go to Step 3
Go to Testing for Intermittent and Poor Connections in Wiring Systems

3
Are both cooling fans running continuously?
Go to Step 5
Go to Step 4

4
Remove the cool fan 3 relay.

Did the right cooling fan turn OFF?
Go to Step 6
Go to Step 7

5
Repair the short to voltage in the left cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 8
--

6
Repair the short to voltage in the left cooling fan low reference circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 8
--

7
Repair the short to voltage in the right cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 8
--

8
Operate the system in order to verify the repair.

Did you correct the condition?
System OK
Go to Step 2