RAM 3500 Truck 2WD L6-6.7L DSL Turbo (2010)
Fan Clutch: Testing and Inspection
DIESEL
NOISE
NOTE: It is normal for fan noise to be louder (roaring) when:
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Fan duty cycle high. This may occur when ambient (outside air temperature) is very high.
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Engine loads and temperatures are high such as when towing a trailer.
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Operating conditions where transmission temperatures may be high
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Cool silicone fluid within the fan drive unit is being redistributed back to its normal disengaged (warm) position. This can occur during the first 15
seconds to one minute after engine start-up on a cold engine.
LEAKS
Viscous fan drive operation is not affected by small oil stains near the drive bearing. If leakage appears excessive, replace the fan drive unit.
ELECTRONICALLY CONTROLLED VISCOUS DRIVE - DIESEL
If the fan assembly does not free-wheel and a metallic grinding sound exists, replace the electronically controlled fan drive See: Service and
Repair/Electric Radiator Fan - Installation.
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. Locate the electronically controlled viscous fan drive connector on the fan shroud.
WARNING: A spark may occur when the connection to battery is made. Be sure there are no combustible materials near the area where this
procedure is being performed.
7. Using a jumper wire, backprobe pin 6 of the viscous fan drive connector to battery positive.
NOTE: The fan drive control coil is energized to 12 volts at this time.
