The conversation between human and AI assistant.
How do I fix my Ford Fiesta heater from only blowing cold air?
No, I haven't checked that yet. How do I check if the thermostat is the problem?
You can test the thermostat by turning on the engine and letting it run until it reaches normal operating temperature. Then, feel the heater hoses. If one hose is hot and the other is cold, the thermostat may be malfunctioning.