Description
| DODGE | RAM 2500 PICKUP | 2004-2009 |
| DODGE | RAM 3500 PICKUP | 2004-2009 |
| DODGE | RAM 4000 | 2005-2009 |
| DODGE | RAM 4500 | 2008-2010 |
| DODGE | RAM 5500 | 2008-2010 |
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The ECM/PCM signal controls the level of engagement of the EV clutch. An internal solenoid opens a spring loaded valve which allows silicone drive fluid to flow from the storage reservoir to the working area of the unit engaging the clutch. This engagement process is ultimately controlled through the ECM/PCM by the following input variables: Coolant Temperature, Intake Manifold Temperature, Transmission Oil Temperature, A/C Pressure and Engine Oil Temperature. These variables are manufacturer specific and fan speed is dictated based on the level of cooling required. Please consult the Original Equipment specifications to determine which set of variables apply to your vehicle. Troubleshooting
During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. This condition will cease shortly upon disengagement. Additionally, you may hear an audible "clicking" sound when the vehicle is stationary. These conditions are normal and should cease once the fan clutch disengages. Installation & Diagnosis Notes
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