Tools You'll Need:
* Repair Manual: Essential for torque specifications and detailed procedures.
* Socket Set: Various sizes, including metric and possibly SAE.
* Wrenches: Open-end, box-end, and possibly adjustable.
* Screwdrivers: Phillips and flathead.
* Pliers: Needle-nose and slip-joint.
* Drain Pan: To catch coolant.
* Jack and Jack Stands: For safe vehicle support.
* New Water Pump: Make sure it's the correct one for your vehicle.
* New Thermostat (optional but recommended): Since you're already in there, it's a good time to replace it.
* New Coolant: The correct type for your vehicle.
* New Gasket(s): For the water pump and possibly others.
* Rags or Shop Towels: To clean up spills and keep things tidy.
* Coolant Flush (optional but recommended): To clean out old coolant and prevent corrosion.
Procedure (General Steps):
1. Safety First: Disconnect the negative battery terminal. Place the vehicle on jack stands after safely raising it with a jack.
2. Drain the Coolant: Locate the drain plug on the engine block (usually low on the radiator). Place your drain pan underneath and carefully remove the plug, allowing the coolant to drain completely.
3. Remove the Serpentine Belt: Consult your repair manual for the proper procedure. It often involves loosening a tensioner pulley.
4. Remove the Fan and Fan Shroud (if applicable): This might involve removing some screws or bolts.
5. Remove the Water Pump Pulley (if applicable): This often requires a puller tool.
6. Disconnect the Water Pump: This usually involves disconnecting the upper and lower radiator hoses, and possibly some electrical connectors depending on the specific sensor arrangement.
7. Remove the Water Pump Bolts: Carefully remove the bolts holding the water pump to the engine block. These can be stubborn, so use penetrating oil if needed.
8. Remove the Old Water Pump: Once the bolts are out, gently pry the old water pump off the engine block. Be careful not to damage the gasket surface on the engine.
9. Clean the Gasket Surface: Thoroughly clean the engine block surface where the water pump sits, removing any old gasket material.
10. Install the New Water Pump: Apply a thin, even layer of gasket sealant (if recommended by the manufacturer) to the new water pump gasket. Carefully install the new water pump, ensuring it's properly seated. Tighten the bolts according to the torque specifications in your repair manual.
11. Reconnect Everything: Reinstall the pulley, fan, fan shroud, serpentine belt, hoses, and electrical connectors.
12. Refill the Cooling System: Add the correct type and amount of coolant, following the instructions in your owner's manual. Bleed the air from the cooling system according to your repair manual. This is crucial to prevent overheating.
13. Check for Leaks: Start the engine and let it run for a while. Carefully check for any leaks around the water pump and hoses.
14. Final Check: Allow the engine to cool completely, then re-check for leaks and the coolant level. Top off as needed.
Important Considerations:
* Torque Specifications: Following the correct torque specifications is crucial to prevent damage to the engine block or the water pump.
* Gasket Sealant: Use only the recommended type and amount of sealant. Too much can cause problems.
* Coolant Type: Use the correct type of coolant specified for your vehicle. Mixing different types can cause damage.
* Air Pockets: Properly bleeding the air from the cooling system is essential.
* Professional Help: If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
This guide provides a general overview. Always refer to a repair manual specific to your 1996 Chevy Blazer S-10 for detailed instructions and torque specifications. Failure to follow proper procedures could result in engine damage or injury.
