Before you begin:
* Consult a repair manual: A Chilton's or Haynes manual specific to your year and model is crucial. It will provide detailed diagrams, torque specifications, and crucial steps you'll need. Online resources like YouTube videos can be helpful supplements, but never replace a proper repair manual.
* Gather your tools: You'll need a variety of tools, including:
* Wrenches (metric) – various sizes, likely including 8mm, 10mm, 13mm
* Socket set (metric) with ratchet and extensions
* Screwdrivers (Phillips and flathead)
* Pliers (needle-nose are helpful)
* Hose clamps pliers (or appropriate replacement clamps)
* Drain pan
* New heater hoses (get the correct length and type; the manual will specify)
* Antifreeze/coolant (the correct type for your car)
* Rags or shop towels
* Safety glasses
* Gloves
Procedure (general steps – consult your repair manual for specifics):
1. Safety First: Disconnect the negative battery terminal. This prevents accidental electrical shorts.
2. Drain the coolant: Locate the drain plug on the engine block (your manual will show you where) and carefully open it into your drain pan. Let the coolant drain completely.
3. Access the hoses: This is where the repair manual's diagrams become invaluable. You'll likely need to remove some under-hood components (air cleaner assembly, etc.) to gain access to the heater hoses. Be methodical and take pictures as you disassemble things to aid reassembly.
4. Remove the old hoses: Carefully disconnect the old heater hoses from their connections at the engine, heater core (located inside the firewall), and the water pump (if applicable). You'll likely need to use pliers to loosen or remove the hose clamps. Be prepared for some coolant spillage, even after draining.
5. Install the new hoses: Carefully install the new heater hoses, ensuring they are properly seated and clamped securely. Use new hose clamps if necessary. Make sure there are no kinks in the hoses.
6. Reassemble: Carefully put back all the components you removed to gain access. Double-check everything is in place before moving on.
7. Refill the coolant: Carefully add the correct type and amount of coolant to the radiator and expansion tank. Refer to your owner's manual for the correct coolant mixture.
8. Bleed the air: Start the engine and let it run until the thermostat opens. Check for leaks around all the connections. You may need to bleed the air from the cooling system; your repair manual will explain how. This usually involves opening bleed valves or burping the system.
9. Test and inspect: Run the engine and heater to ensure proper operation and check for leaks.
Important Considerations:
* Coolant is toxic: Handle coolant carefully and avoid skin contact. Wash your hands thoroughly after handling it.
* Engine is hot: Allow the engine to cool down completely before starting the work.
* Pressure in the system: The cooling system is pressurized. Be careful when working with it.
* Complexity: This repair involves working in tight spaces and potentially delicate components. If you are not comfortable, seek professional help.
This is a general outline. Always consult your repair manual for the specific procedures and torque specifications for your vehicle. Improperly replacing heater hoses can lead to engine overheating and serious damage. If you're not comfortable with this repair, it's best to leave it to a qualified mechanic.
