Here's a general outline. This is NOT a complete, step-by-step guide, and specific procedures may vary slightly depending on your engine type (e.g., 4.3L V6, 5.0L V8). Consult a repair manual specific to your 1989 GMC Safari for precise instructions and torque specifications. A Haynes or Chilton manual will be invaluable.
1. Preparation:
* Gather Tools: You'll need a variety of wrenches (metric), sockets, a ratchet, a power steering pump pulley puller, a fluid catch pan, new power steering fluid (the correct type for your van), jack stands (crucial!), jack, rags, gloves, safety glasses, and possibly a torque wrench.
* Vehicle Prep: Park on a level surface, engage the parking brake firmly, and chock the rear wheels. Raise the front of the van securely using a jack and place it on jack stands.
* Fluid Drain: Locate the power steering fluid reservoir. Carefully drain as much fluid as possible into a catch pan. Be aware that some fluid will remain in the lines.
2. Accessing the Pump:
* Belt Removal: Remove the serpentine belt (or the individual power steering pump belt if it's not a serpentine system). Consult your repair manual for the proper procedure. Usually, you'll need to loosen the tensioner pulley.
* Disconnect Lines: Locate the high-pressure and low-pressure lines connected to the power steering pump. These will likely have clamps. Use the appropriate wrench to loosen the clamps and carefully disconnect the lines. Have your fluid catch pan ready; some fluid will leak out.
* Disconnect Electrical Connector (if applicable): Some pumps have an electrical connector. Disconnect it.
3. Pump Removal:
* Remove Pulley (if necessary): If the pulley is separate from the pump, use a power steering pump pulley puller to remove it. This tool is essential to avoid damaging the pump or pulley.
* Remove Mounting Bolts: Carefully remove the bolts holding the power steering pump to the engine block. These bolts are often difficult to access.
* Remove Pump: Gently remove the power steering pump from its mounting location.
4. Installation:
* Install New Pump: Install the new power steering pump in reverse order of removal. Ensure that it's seated properly.
* Install Pulley (if necessary): Reinstall the pulley using the correct procedure, ensuring it's properly aligned.
* Reconnect Lines: Carefully reconnect the high-pressure and low-pressure lines, ensuring the connections are secure and the clamps are tightened properly.
* Reconnect Electrical Connector (if applicable): Reconnect the electrical connector.
* Reinstall Belt: Reinstall the serpentine belt (or individual power steering pump belt), ensuring proper tension.
5. Final Steps:
* Lower Vehicle: Carefully lower the vehicle from the jack stands.
* Fill Reservoir: Add the correct type and amount of power steering fluid to the reservoir. Consult your owner's manual or repair manual for the proper fluid type and amount.
* Bleeding the System: Start the engine and turn the steering wheel fully to the left and right several times. Check the fluid level and add more as needed. There might be air in the system that needs to be bled; consult your repair manual for bleeding procedures if necessary.
* Check for Leaks: Inspect all connections for leaks.
Important Considerations:
* Repair Manual: A repair manual is absolutely crucial. Generic instructions are insufficient for a complex job like this.
* Torque Specifications: Use a torque wrench to tighten bolts to the manufacturer's specified torque settings. Over-tightening can damage parts.
* Fluid Type: Use the correct power steering fluid as specified in your owner's manual.
* Professional Help: If you're not comfortable with this type of repair, consider taking your vehicle to a qualified mechanic.
This is a complex task. Attempting it without proper knowledge and tools can lead to further damage or injury. Always prioritize safety and consult a repair manual.
