What are the causes of 2004 Honda civic ac stop blowing cold air?

1. Low refrigerant level: This is the most common cause of an AC not blowing cold air. Over time, refrigerant can leak from the system, causing the pressure to drop and the AC to stop working properly.

2. Compressor failure: The compressor is the heart of the AC system, and if it fails, the AC will not be able to circulate refrigerant and cool the air. Compressor failure can be caused by a number of things, including:

* A seized compressor

* A broken compressor clutch

* A faulty compressor solenoid

* A lack of lubrication

3. Condenser failure: The condenser is a heat exchanger that helps to dissipate heat from the refrigerant. If the condenser fails, the refrigerant will not be able to cool down properly and the AC will not be able to blow cold air. Condenser failure can be caused by a number of things, including:

* A blocked condenser

* A damaged condenser

* A faulty condenser fan

4. Evaporator failure: The evaporator is a heat exchanger that helps to absorb heat from the air inside the car. If the evaporator fails, the AC will not be able to cool the air properly. Evaporator failure can be caused by a number of things, including:

* A blocked evaporator

* A damaged evaporator

* A faulty evaporator fan

5. Expansion valve failure: The expansion valve controls the flow of refrigerant into the evaporator. If the expansion valve fails, the AC will not be able to regulate the amount of refrigerant flowing into the evaporator and the AC will not be able to cool the air properly. Expansion valve failure can be caused by a number of things, including:

* A blocked expansion valve

* A damaged expansion valve

* A faulty expansion valve solenoid