1. Your blend door is stuck. The blend door is a part of the heater/AC system that controls the amount of hot and cold air that comes out of the vents. If it is stuck, it will only allow hot air to come out.
2. The hot water heater valve is stuck. This valve controls the flow of hot water to the heater core. If it is stuck in the open position, it will only allow hot air to come out of the heater.
3. The coolant level is low. If the coolant level is too low, it will not be able to absorb the heat from the engine, causing your heater to blow hot air.
4. The air filter is clogged. This filter can block the flow of air to the heater, preventing the cold air from being properly heated.
Some ways to fix the issue:
- Replace the blend door
- Replace the hot water heater valve
- Add coolant to the system
-Replace the air filter
