Here's a general outline. Specific details may vary slightly depending on the exact engine (4.3L V6 or 2.8L V6). Consult a repair manual specific to your year and engine for precise instructions and diagrams:
1. Preparation:
* Gather Tools: You'll need a socket wrench set (metric), a ratchet, extensions, a wrench to loosen the pump pulley bolt (often requires a breaker bar or impact wrench), pliers, a drain pan, and possibly a power steering pump puller.
* Drain Power Steering Fluid: Locate the power steering fluid reservoir and carefully drain the fluid into the drain pan. You may need to loosen a line or use a pump to fully drain it.
2. Accessing the Pump:
* Remove Serpentine Belt: Loosen the tensioner pulley to remove the serpentine belt. The method for doing this varies slightly depending on the year and model, but generally involves using a socket wrench on a specific bolt. Consult a repair manual for your specific vehicle.
* Remove Pulley (If Necessary): Some pumps require removing the pulley before removing the pump itself. This usually involves a large bolt in the center of the pulley. Use the appropriate socket and a breaker bar or impact wrench as it's typically very tight. A pulley puller might be necessary if the bolt is stripped or the pulley is stubborn.
3. Removing the Pump:
* Disconnect Power Steering Lines: Carefully loosen and remove the high-pressure and low-pressure power steering lines from the pump. Have rags ready to absorb any residual fluid. Mark the lines if you're unsure of their placement during reinstallation.
* Remove Mounting Bolts: Locate the bolts securing the pump to the engine block. They are usually two or three bolts. Unscrew these bolts.
* Remove the Pump: Once the bolts are removed, the pump should be free to come off. However, it might be a tight fit, and you might need to wiggle it or gently tap it with a rubber mallet. A power steering pump puller may help if it's stuck.
4. Reinstallation (Reverse Order):
Follow the steps above in reverse order to reinstall the new pump. Ensure you tighten all bolts and connections securely. Add the correct type and amount of power steering fluid to the reservoir. After installation, bleed the air from the system by turning the steering wheel lock-to-lock several times with the engine running. Check for leaks.
Important Considerations:
* Repair Manual: A repair manual specific to your 1994 S10 Blazer is highly recommended. It will provide detailed diagrams, torque specifications, and step-by-step instructions tailored to your vehicle.
* Safety: Always wear safety glasses and gloves when working on your vehicle. Power steering fluid is corrosive.
* Difficulty: This is a moderately challenging repair job. If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic.
This is a general guide. Referencing a specific repair manual for your vehicle is crucial for accurate and safe completion of the job. Failing to do so could lead to damage or injury.
