Here's a breakdown, assuming you're looking to *repair or replace* an existing system rather than add a completely new one:
1. Diagnosis:
* Identify the problem: Is the blower not working? Is there no heat? Is there a leak? A proper diagnosis is crucial before starting any repairs. Check fuses, relays, and wiring first.
* Check the coolant level: Low coolant will significantly reduce heating performance.
* Test the blower motor: Disconnect it and test it with a multimeter to see if it's receiving power and if it functions correctly.
* Check heater core hoses: Ensure they're connected and not leaking. Feel them while the engine is running to see if hot coolant is flowing.
* Inspect the heater control valve (if applicable): This valve regulates coolant flow to the heater core. Make sure it operates correctly.
2. Repair/Replacement (Assuming Existing System):
* Blower motor: Replacing a blower motor usually involves removing the dashboard or parts of it to access the motor. This requires patience and careful disassembly. You'll need to disconnect the wiring harness and possibly remove some ductwork.
* Heater core: This is a much more involved job. It usually requires draining the coolant, partially disassembling the dashboard, and removing the heater core from its location within the firewall. Expect leaks when doing this, so have plenty of rags and coolant recovery containers ready. This is a messy job requiring patience and a good understanding of the system's plumbing.
* Heater control valve: Replacing this valve is usually easier than replacing the heater core, but still requires accessing the plumbing under the dash.
* Wiring and fuses: Inspect all wiring related to the heater for damage, corrosion, or loose connections. Replace any faulty fuses.
* Thermostat: While not directly part of the heater, a malfunctioning thermostat will affect the engine's temperature and thus the heating system's effectiveness.
3. Installing a completely new heating system (Extremely difficult and not recommended unless you're highly experienced):
This is impractical without significant knowledge of automotive HVAC systems and fabrication skills. It would involve:
* Sourcing a complete heating system (core, blower, hoses, ducts, controls). This may be difficult to find for a vehicle that old.
* Fabricating or adapting components to fit the truck's existing structure.
* Routing new hoses and ductwork.
* Integrating the new system into the existing electrical system.
Resources:
* Repair Manual: A Haynes or Chilton repair manual specific to a 1983 Chevrolet pickup is highly recommended. It will have diagrams, instructions, and torque specifications.
* Online Forums: Search for forums dedicated to classic Chevrolet trucks. You might find others who have tackled this job and can offer advice or solutions.
* Local Mechanic: If you are uncomfortable with the complexities, it's best to consult a qualified mechanic specializing in older vehicles.
Important Notes:
* Coolant is toxic: Wear gloves and eye protection when working with it.
* Always disconnect the battery's negative terminal before working on any electrical components.
* Take lots of pictures: Document the disassembly process to help with reassembly.
* Be patient: Working on an older vehicle can be time-consuming and challenging.
Replacing or repairing a heater in a 1983 Chevrolet pickup is a substantial undertaking. Unless you have significant experience working on vehicles, it's strongly recommended to seek professional help. The cost of professional repair might be less than the cost of your time and potential mistakes.
