Here's a general outline of the process, but keep in mind this is a *simplified overview*. Details will vary significantly depending on the specific engine and cab configuration of your truck. Always consult a repair manual specific to your year, make, model, and engine. A factory service manual is ideal.
Before You Begin:
* Gather Tools: You'll need a variety of tools, including but not limited to: screwdrivers (Phillips and flathead), sockets (various sizes), wrenches (various sizes), pliers, a coolant recovery system, a drain pan, shop rags, a new heater core, possibly a new heater core housing (depending on condition), and possibly a flush kit for the cooling system.
* Safety First: Wear safety glasses, gloves, and appropriate clothing. Coolant is toxic.
* Consult a Repair Manual: This is absolutely crucial. The steps below are general and may not be entirely accurate for your specific truck. A repair manual will provide detailed diagrams and instructions.
* Drain the Coolant: Completely drain the engine's coolant system. This is usually done by opening the drain valve on the radiator and engine block.
General Steps (Highly Simplified):
1. Access the Heater Core: This is the most challenging part. It usually involves removing the dashboard, or at least significant portions of it. This requires disconnecting various components, including electrical connectors, HVAC controls, and possibly the glove box. Your repair manual will detail this process.
2. Remove the Heater Core Housing: Once the dashboard is partially disassembled, you'll need to access and remove the heater core housing. This often involves removing various screws, bolts, and possibly clips.
3. Remove the Old Heater Core: The old heater core will likely be attached to the housing with several connections. Be careful to disconnect these carefully and avoid damaging the new core.
4. Install the New Heater Core: Carefully install the new heater core into the housing, ensuring it's seated correctly.
5. Reinstall the Heater Core Housing: Reassemble the heater core housing, securing it properly with all bolts and screws.
6. Reassemble the Dashboard: Carefully reassemble the dashboard and all components you removed earlier. Ensure all electrical connectors are properly secured.
7. Refill and Bleed the Cooling System: Once everything is reassembled, refill the cooling system with the correct type and amount of coolant. Then, bleed the system to remove any air pockets. This is critical to prevent overheating.
8. Test the System: Start the engine and test the heater. Check for leaks and ensure the heater is working properly.
Important Considerations:
* Corrosion: Expect rust and corrosion in the area around the heater core.
* Leaks: Be prepared for coolant spills.
* Time Commitment: This repair can easily take a full day or even longer, depending on your experience and the condition of your truck.
Again, I strongly recommend consulting a repair manual specific to your 1997 Dodge Ram and seeking professional help if you're not comfortable with this type of repair. Improperly installed heater cores can lead to further damage and safety hazards. A seemingly small mistake can lead to significant complications and expenses down the road.
