1. Identify Fan Type:
* Clutch Fan: Has a visible clutch assembly with moving parts.
* Viscous Fan: Appears as a single, sealed unit.
2. Clutch Fan Removal (More Common):
* Safety First: Disconnect the negative battery terminal.
* Tools: Socket wrench set, possibly a fan clutch wrench (special tool to grip the fan clutch). Some people can use large channel locks carefully, but a wrench is recommended.
* Procedure:
1. Remove Fan Shroud: This is usually held on by several screws or clips. Carefully remove it.
2. Remove Fan Clutch: Use the appropriate socket or fan clutch wrench to hold the pulley stationary while turning the nut on the back of the fan clutch. This nut threads *onto* the water pump pulley. Turn counterclockwise to loosen. It can be very tight, so be prepared to apply significant force. A breaker bar might be helpful.
3. Separate Fan from Clutch: Once the nut is removed, the fan should slide off the clutch.
3. Viscous Fan Removal (Less Common):
* Safety First: Disconnect the negative battery terminal.
* Tools: Socket wrench set, possibly a puller (depending on the stubbornness of the fan).
* Procedure:
1. Remove Fan Shroud: As above.
2. Remove Fan: Viscous fans are usually held on by a nut or bolt in the center. Remove this. The fan may still be difficult to remove due to the viscous coupling's resistance. If it's stuck, a gentle tap with a rubber mallet may help. A puller is a good option for stubborn fans. Be extremely careful not to damage the water pump or radiator.
Important Considerations:
* Cooling System Pressure: The cooling system might still be under pressure even after the engine has cooled. Allow sufficient time for it to cool completely before starting work to avoid burns from hot coolant.
* Fluid Leaks: Be prepared for some coolant leakage during the process. Have rags ready.
* Corrosion: Nuts and bolts may be rusted or seized. Penetrating oil (like PB Blaster) applied well in advance can help.
* Torque Specifications: When reinstalling the fan, refer to a repair manual for the correct torque specifications to avoid damage. Tightening too much can damage components.
Recommendation:
Consult a repair manual specific to your 1997 Dodge van's 318 engine. These manuals provide detailed diagrams, torque specifications, and step-by-step instructions. A Haynes or Chilton manual would be a great investment for future repairs. Incorrectly removing or reinstalling the fan can lead to damage to your engine or cooling system. If you are uncomfortable with this repair, take your van to a qualified mechanic.
