1. Low Coolant Level: Check the coolant level in the overflow tank. If it's low, add more coolant and keep an eye on the level to ensure it's not leaking.
2. Faulty Thermostat: A faulty thermostat can prevent hot coolant from circulating through the heater core, resulting in cold air.
3. Clogged Heater Core: The heater core can become clogged over time, restricting the flow of hot coolant. Try flushing the heater core with a garden hose to remove any debris.
4. Faulty Blend Door: The blend door controls the mix of hot and cold air that enters the cabin. If the blend door is stuck or malfunctioning, it can result in cold air only.
5. Faulty Blower Motor: The blower motor is responsible for circulating the air through the heater and cabin. If the blower motor is malfunctioning, it may not be able to produce enough airflow, resulting in a lack of heat.
