Here's a general outline of the process. This is NOT a complete, step-by-step guide. You'll need a detailed repair manual specific to your 1972 F-100's model and engine. Using a Haynes or Chilton manual is highly recommended.
Before You Begin:
* Disconnect the battery's negative terminal. This is crucial for safety.
* Gather your tools. You'll need various wrenches, screwdrivers (Phillips and flathead), pliers, sockets, a drain pan, coolant, and possibly a sealant for the heater core.
* Prepare your workspace. You'll need adequate lighting and space to work comfortably.
Replacing the Heater Core:
1. Drain the coolant: This is essential to avoid a mess. Consult your manual for the drain plug location.
2. Access the heater core: This usually involves removing parts of the dashboard or firewall. The exact procedure varies greatly depending on your truck's configuration. You likely need to remove the glove box, possibly the steering column, and perhaps other components for access. Your repair manual will guide you through this process with diagrams and specific instructions.
3. Disconnect the heater hoses: Carefully disconnect the heater hoses from the core. Have a rag ready to absorb any remaining coolant.
4. Remove the heater core: This is often the most challenging part. The core may be held in place by clamps, screws, or a combination of both. Be gentle to avoid damaging the core or surrounding components.
5. Install the new heater core: Carefully install the new heater core, ensuring a proper seal. Use new gaskets if necessary.
6. Reconnect the heater hoses: Reattach the heater hoses and tighten the clamps securely.
7. Reassemble everything: Carefully reinstall all removed components in the reverse order of removal.
8. Refill the coolant system: Refill the radiator and coolant reservoir with the correct type of coolant and distilled water, as specified in your owner's manual. Bleed the air out of the system to avoid overheating.
Replacing the Blower Motor:
1. Access the blower motor: This usually involves removing parts of the dashboard or the blower motor housing itself. Again, your repair manual is crucial here.
2. Disconnect the electrical connector: Unplug the blower motor's electrical connector.
3. Remove the blower motor: The motor may be held in place by screws or clips.
4. Install the new blower motor: Install the new blower motor, ensuring it's properly seated and secured.
5. Reconnect the electrical connector: Plug the connector back in securely.
6. Reassemble everything: Reinstall all the components you removed.
Important Considerations:
* Repair Manual: A repair manual is absolutely essential for this job. Generic instructions are not sufficient.
* Patience and Organization: This is a time-consuming job. Take your time, stay organized, and take photos as you disassemble components to aid in reassembly.
* Safety: Wear safety glasses and gloves. Coolant is corrosive.
Attempting this repair without a repair manual and sufficient mechanical experience could lead to damage to your truck. If you're uncomfortable doing this repair yourself, consider taking your F-100 to a qualified mechanic.
