[xtrm-s10]

Truck is in the sig. Getting hot and fan doesn't come on. Installed a new fan clutch still a no go. What turns on the fan? Also can i just pin it and have it on all the time?

 

[waywardtravel]

Turn on the air conditioning then walk to the engine with the hood up put your hand at 10 or 2 oclock above and behind the fan shroud. within about 45 seconds it should come on .

What temp?

 

[Klevingston]

Electronically controlled and a few items will tell it to lock. A/C as stated above, also Coolant temp sensor.

Are you throwing any codes?

 

[Klevingston]

It does take its commands through ECM, usually throws codes, but one of the common issue is the harness wiring in first step checks

 

[coder]

Here are the testing notes from the manual:

ELECTRONICALLY CONTROLLED VISCOUS DRIVE – 5.9L DIESEL
If the fan assembly does not free-wheel and a metallic
grinding sound exists, replace the electronically controlled
fan drive (Refer to 7 - COOLING/ENGINE/RADIATOR
FAN - REMOVAL).

NOTE: The following test may take up to 15 minutes
to perform. The engine should be at normal operating temperature.

1. Set the parking brake and verify the transmission
is in park or neutral.
2. Set air conditioner (if equipped) and blower fan to
OFF.
3. Start and allow engine to reach normal operating
temperatures.
4. Stop engine, connect the scan tool and select
appropriate model year and engine option.
5. Check for and correct existing DTC’s
6. Using Tool 6801, backprobe pin 1 of the electronically controlled viscous fan drive connector, with the harness
connected located at the lower fan shroud to battery ground.

NOTE: The fan drive control coil is energized to 12 volts at this time.
WARNING: A spark may occur when connecting pin to ground. Be sure that no combustible material is in
the area.

7. Using the scan tool, verify that DTC 0480 set. If it is not set, verify that a good ground is available.
8. Start the engine.
9. Actuate engine speed to 2000 RPM.
10. Go to the SENSOR screen and observe the fan speed.
11. Run the engine at 2000 RPM until the fan speed increases to 1850 RPM or more for 30 seconds.

NOTE: Fan RPM may ramp up slowly.
NOTE: It maybe take 15 minutes before fan speed increases.

12. The fan speed should be in accordance to the table below.
13. If fan speed does not increase, make sure that the jumper wire has a good connection. If so replace the electronically
control viscous fan drive.

 

[coder]

delete.......

 

[Klevingston]

Check your fuse. I think it's a 10amp

 

[xtrm-s10]

Temp has been as high as 215. Ac dosent blow cold any more.just had it replaced 3mths ago. also no codes. the last fan clutch through a code low voltage

 

[Mr.dudemanbro]

Im also having an overheating problem. I can ground out pin one, it didn't make a difference at idle but it wouldn't over heat. So just because its not making a change at idle don't be fooled. Good luck

 

[waywardtravel]

Did you do the test?

Check the wiring from the under truck connector to the fan clutch. A blown belt or poor install takes out the wiring.
'

 

[xtrm-s10]

Will do the test today if i have the time. Work is a bittch lately.