Here's a general outline of the process. Details may vary slightly depending on your specific engine (2.2L or 2.4L).
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Wear safety glasses and gloves.
* Gather Tools: You'll need a variety of tools including wrenches (metric), sockets, a ratchet, a torque wrench, pliers, a drain pan, jack stands (crucial for safety), and possibly a power steering pump pulley puller. Consult your repair manual for the specific sizes.
* Fluid: Have fresh power steering fluid ready. Use the correct type specified in your owner's manual.
* Repair Manual: A Haynes or Chilton manual for your specific year and model is highly recommended. It provides detailed diagrams and torque specifications.
2. Accessing the Power Steering Pump:
* Raise and Secure the Vehicle: Safely jack up the front of your Sunfire and secure it on jack stands.
* Locate the Pump: The power steering pump is typically located on the engine, often driven by a belt.
* Drain the Power Steering Fluid: Locate the power steering fluid reservoir and carefully drain the fluid into a drain pan.
3. Removing the Power Steering Pump:
* Disconnect the Power Steering Lines: Carefully disconnect the high-pressure and low-pressure power steering lines from the pump. Be prepared for some fluid spillage, even after draining the reservoir. Important: Mark which line goes where to avoid confusion during reassembly. You may need line wrenches to prevent damage.
* Remove the Belt: Remove the serpentine belt (or the belt that drives the power steering pump if it's separate). You may need to loosen the tensioner pulley to do this.
* Disconnect Electrical Connectors: Disconnect any electrical connectors attached to the pump.
* Remove the Pump Mounting Bolts: Carefully remove the bolts securing the power steering pump to the engine block. These can be stubborn, so use penetrating oil if needed.
* Remove the Pump: Once the bolts are out, carefully remove the power steering pump. You may need to gently wiggle or pry it free.
4. Installing the New Power Steering Pump:
* Install new pump gasket and O-rings. This is crucial for leak prevention.
* Install the New Pump: Carefully install the new power steering pump, ensuring it's seated correctly.
* Reconnect the Pump Mounting Bolts: Tighten the mounting bolts to the manufacturer's specified torque (found in your repair manual).
* Reconnect Electrical Connectors.
* Reconnect Power Steering Lines. Ensure tight connections to prevent leaks.
* Install the Serpentine Belt (or appropriate belt). Ensure proper belt routing.
* Fill the Power Steering Reservoir: Add the correct type and amount of power steering fluid as specified in your owner's manual.
5. Testing and Finishing:
* Lower the Vehicle: Carefully lower your Sunfire from the jack stands.
* Start the Engine: Start the engine and carefully check for leaks around the pump and lines.
* Turn the Steering Wheel: Turn the steering wheel lock-to-lock several times to circulate the fluid. Check the fluid level and top it off if needed.
* Check for Leaks: After running the engine for a few minutes, carefully inspect for any leaks.
Important Considerations:
* Professional Help: If you're not comfortable with this type of repair, it's best to take your car to a qualified mechanic. Incorrect installation can lead to serious damage.
* Torque Specifications: Always refer to your repair manual for the correct torque specifications for all bolts and connections. Over-tightening can damage components.
* Fluid Type: Use the correct type of power steering fluid specified in your owner's manual.
This is a simplified overview. Always consult a repair manual specific to your 1999 Pontiac Sunfire for detailed instructions and diagrams. Remember safety is paramount. If you are unsure about any step, seek professional help.
