Disclaimer: The following is a general guide. Specific procedures may vary slightly depending on the engine size (3.9L, 5.2L, 5.9L are common in '89 Ram vans) and your van's specific configuration. Always consult a repair manual specific to your year, make, model, and engine. A Haynes or Chilton manual is a good investment.
Tools and Materials You'll Likely Need:
* Repair Manual: Absolutely essential for accurate procedure and torque specifications.
* Jack and Jack Stands: Safety first! Secure the van properly.
* Wheel Chocks: To prevent the van from rolling.
* Wrench Set (Metric): Various sizes, including sockets, ratchets, and extensions.
* Screwdrivers (Phillips and Flathead):
* Pliers: Various types, including needle-nose.
* New Water Pump: Get the correct one for your engine.
* New Thermostat (Recommended): Often replaced at the same time.
* New Gasket(s): For the water pump and thermostat.
* New Antifreeze/Coolant: Use the correct type for your system.
* Drain Pan: To catch the coolant.
* Funnel: For refilling the coolant.
* Torque Wrench: Crucial for tightening bolts to the proper specification.
* Cooling System Pressure Tester (Recommended): To check for leaks after the repair.
General Steps (Consult your repair manual for precise details):
1. Prepare the Vehicle: Disconnect the negative battery terminal. Raise the van securely using the jack and jack stands, and place wheel chocks.
2. Drain the Coolant: Locate the drain plug on the radiator and engine block (if applicable). Open them and let the coolant drain completely into your drain pan.
3. Remove Accessory Components: This is highly engine-specific. You'll likely need to remove the fan, fan shroud, belts (including the serpentine belt), and potentially other components to access the water pump. Your repair manual will guide you on the order and method for removing these. Take photos as you go to help with reassembly.
4. Remove the Water Pump: This usually involves removing bolts securing the pump to the engine block. You'll likely need to carefully pry the pump away. Be prepared for some stubborn bolts.
5. Clean the Mounting Surface: Thoroughly clean the mating surface of the engine block where the new pump will be installed. Remove any old gasket material.
6. Install the New Water Pump: Apply a thin, even bead of gasket sealant (if required by the new pump's instructions) to the new pump gasket and install the new water pump, aligning it correctly. Tighten the bolts to the specifications listed in your repair manual using a torque wrench.
7. Reinstall Components: Carefully reinstall all the components you removed earlier in the reverse order of removal. Pay close attention to belt routing.
8. Fill the Cooling System: Refill the radiator and overflow tank with the correct type and amount of antifreeze/coolant. Consult your owner's manual for the proper mixture ratio.
9. Bleed the Air from the System: Run the engine for a few minutes, checking for leaks. Then, let it cool and top off the coolant. You may need to bleed the air from the system, which might involve opening a bleed valve (if present) or squeezing hoses to help air escape. This is engine-specific and your manual will provide details.
10. Test the System: Once the engine is cool, inspect for leaks. A pressure tester is strongly recommended to check the cooling system for leaks under pressure.
Important Considerations:
* Rust and seized bolts: Older vehicles often have rusty and seized bolts. Use penetrating oil to help loosen them and be prepared to use considerable force (but avoid damaging the engine block).
* Timing Belt Interference: On some engines, the water pump is driven by the timing belt. If this is the case, replacing the timing belt is often recommended at the same time. This is a much more complex procedure.
* Safety: This repair involves working with hot coolant and heavy parts. Always prioritize safety, wear appropriate safety glasses and gloves.
This is a complex procedure. If you lack the experience or tools, it is strongly recommended to have this repair done by a qualified mechanic. Improperly installing the water pump can lead to serious engine damage.
