Simple Checks (Do these first):
* Is the blower motor working? Turn the fan to its highest setting. If you hear nothing, the blower motor, its resistor, or its fuse/relay might be faulty. Check the fuse (usually in the under-hood fuse box) and relay (location varies, check your owner's manual). A failing blower motor resistor is a common culprit as it controls fan speeds.
* Is the temperature control working? Can you change the temperature settings? If the control panel itself is malfunctioning, the heat may not be activated even if the system is otherwise fine.
* Are the vents open? Sounds obvious, but check all the vents to make sure they're not blocked or closed.
* Is the coolant level low? Check the coolant reservoir. Low coolant means the system can't generate heat. If low, add coolant (50/50 mix of antifreeze and distilled water). WARNING: Do not open the radiator cap when the engine is hot; it can cause serious burns.
* Is the thermostat stuck closed? A faulty thermostat prevents coolant from circulating, preventing heat from reaching the heater core.
More Involved Problems (Require some mechanical knowledge or professional help):
* Heater core failure: The heater core is a small radiator inside the car that warms the air. If it's clogged, leaking, or has failed, no heat will reach the vents. This is a significant repair as it often requires dashboard disassembly.
* Water pump failure: The water pump circulates coolant through the engine and heater core. A failing pump means no coolant flow and no heat.
* Blend door actuator failure: This small motor controls the mix of hot and cold air. A malfunctioning actuator could prevent hot air from reaching the vents.
* Low coolant pressure: Even if you have enough coolant, low pressure might prevent proper circulation and heat transfer. A pressure test might be needed to diagnose this.
* Radiator cap failure: A faulty radiator cap can prevent the system from maintaining proper pressure.
Troubleshooting Steps:
1. Start with the simple checks. If the blower motor isn't working, focus on that first. If the coolant is low, refill it and check for leaks.
2. Check fuses and relays. A blown fuse or faulty relay can easily cut power to parts of the heating system.
3. Feel the heater core hoses. With the engine running and the heater on, feel the hoses going to and from the heater core. They should both be warm. If one is cold, it indicates a problem with coolant flow.
4. Consult a repair manual: A repair manual specific to your 2000 Ford Windstar will provide detailed diagrams and troubleshooting steps.
If you're not comfortable tackling these problems yourself, take your Windstar to a qualified mechanic for diagnosis and repair. A proper diagnosis is crucial to avoid unnecessary repairs and expenses. Remember safety first, especially when working with hot coolant.
