If your heater isn't working correctly, the problem could be one or more of the following:
* Blend door actuator: This is a motor that moves the blend doors to adjust the mix of hot and cold air. A faulty actuator is a common cause of heater problems. It's located inside the dashboard, requiring partial disassembly to access.
* Vacuum lines: The blend doors might be controlled by vacuum lines. Leaks in these lines can prevent the system from working correctly.
* Heater core: This is the radiator that heats the air. A clogged or leaking heater core requires more extensive repair or replacement.
* Water pump: If the engine coolant isn't circulating properly, the heater core won't heat.
* Thermostat (engine): While not a *heater* thermostat, a malfunctioning engine thermostat can prevent the engine from reaching operating temperature, thus reducing heater output. This is a different thermostat than you might be thinking of.
To diagnose the issue, you'll likely need to:
1. Check coolant level: Make sure your coolant level is correct.
2. Check for vacuum leaks: Inspect the vacuum lines connected to the climate control system.
3. Consult a repair manual: A repair manual specific to your 2000 Ford Windstar LX will show the location of components and provide troubleshooting steps. This is highly recommended before attempting any repairs.
Because of the complexity of the system, it's best to consult a mechanic if you're not comfortable working on your vehicle's HVAC system. Replacing a blend door actuator or heater core is a significant undertaking.
