Tools:
* Flathead screwdriver (medium size): For prying back hose clamps if they're the standard screw-type.
* Slip-joint pliers or needle-nose pliers: To help loosen stubborn clamps. Sometimes the clamp itself is easier to manipulate with pliers than a screwdriver.
* Basin or container: To catch the coolant that will spill out. The system should be cool before you start.
* Rags or shop towels: To clean up spills.
* Optional: Hose clamp pliers: These make removing and reinstalling hose clamps much easier and less prone to damaging the hoses. They're inexpensive and well worth having if you do much work on your car.
Procedure:
1. Cool the Engine: Let the engine cool completely before attempting this. Coolant is hot and under pressure when the engine is running or even recently off. Burns are a serious risk.
2. Locate the Heater Hoses: These typically connect to the heater core on the firewall, usually near the passenger side of the engine compartment. They're usually two hoses: one supply (hot) and one return (cool). They may be different sizes.
3. Position the Container: Place your container under the hoses to catch the coolant.
4. Loosen the Hose Clamps: Carefully loosen the hose clamps on both heater hoses using your screwdriver and/or pliers. Work slowly to avoid damaging the hoses. If using pliers, be gentle to avoid crushing the clamp. Hose clamp pliers will make this much easier.
5. Disconnect the Hoses: Once the clamps are loose enough, gently try to wiggle the hoses off the heater core connections. If they're stuck, you may need to gently work them back and forth while pulling. Avoid excessive force, as this could damage the hoses or fittings.
6. Catch the Coolant: Coolant will spill out as you disconnect the hoses. This is why the container is crucial.
7. Clean Up: Once the hoses are disconnected, clean up any spilled coolant.
Important Considerations:
* Type of Clamps: Some vehicles use different types of clamps. If you have a newer vehicle or unusual clamp type, you may need a special tool, such as a special type of pliers.
* System Pressure: Even after the engine has cooled, there might still be some residual pressure in the cooling system. Be prepared for some coolant to spill.
* Coolant Type: Note the type of coolant you have so you can replace it correctly. Mixing different types can be detrimental to the cooling system.
After disconnecting the hoses: You might want to plug the heater core ports to prevent debris from entering the system. You can use appropriately sized bolts or rubber plugs.
Remember safety first! Always wear safety glasses and work in a well-ventilated area when dealing with automotive fluids. If you're uncomfortable performing this task, it's best to consult a mechanic.
