1. Viscous Fan Clutch (Most Common on 1997 Tahoes):
* Safety First: Disconnect the negative battery terminal.
* Access: You'll need to access the fan from the front of the vehicle. This usually involves removing the shroud (plastic housing surrounding the fan). The shroud may be held on by screws, clips, or a combination of both. Locate these fasteners and carefully remove them.
* Fan Removal: Once the shroud is off, you'll see the fan assembly. The fan itself is attached to the water pump pulley via a viscous clutch. You'll typically need a fan clutch wrench (special socket) to remove the fan assembly. This wrench fits onto the nut at the center of the fan clutch. Turn it counter-clockwise to remove it. It might be quite tight, so use a breaker bar if necessary. Be prepared for the fan to be heavy.
* Reassembly: Reassembly is the reverse of removal. Remember to torque the nut to the manufacturer's specification (found in your repair manual).
2. Electric Fan:
* Safety First: Disconnect the negative battery terminal.
* Access: Access will again likely require shroud removal (as above). Electric fans are usually mounted to the radiator itself or a separate mounting bracket.
* Fan Removal: Locate the electrical connector for the fan motor and disconnect it. There will be mounting bolts securing the fan to the radiator or bracket. Remove these bolts. The fan should then come off.
* Reassembly: Reassembly is the reverse of removal. Ensure the electrical connector is securely connected.
Important Considerations:
* Repair Manual: A repair manual specific to your vehicle is crucial. It will provide detailed diagrams, torque specifications, and specific removal procedures.
* Tools: You'll likely need various tools, including sockets, wrenches, screwdrivers, possibly a breaker bar, and potentially a fan clutch wrench.
* Coolant: If you're working near the radiator, be prepared for some coolant to spill. It's advisable to drain some coolant beforehand to minimize the mess.
* Safety Glasses and Gloves: Always wear safety glasses and gloves to protect yourself from sharp edges, hot coolant, and other hazards.
If you're not comfortable performing this repair yourself, it's best to take your Tahoe to a qualified mechanic. Improper removal or reinstallation can cause damage to your engine cooling system.
