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why is my evaporator coil blowing cold air

HVAC

The answer to 'why is my evaporator coil blowing cold air' is that the evaporator coil is likely freezing up, which is causing the cold air to blow. This can happen due to a few common causes, such as low refrigerant levels, a blocked air filter, or a malfunctioning blower fan.

If the evaporator coil is freezing, it means the coil is not able to absorb heat from the air as efficiently as it should. This can lead to the coil becoming too cold and causing condensation to freeze on the coil, restricting airflow and leading to the cold air blowing.

Sources

1
2
Energy Star• authority
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DIY Network• guide

Step-by-Step Guide

  1. 1

    Check the air filter

    Start by checking the air filter and replacing it if it's dirty or clogged. A blocked filter can restrict airflow and cause the evaporator coil to freeze.

  2. 2

    Inspect the refrigerant level

    Low refrigerant levels can also lead to the evaporator coil freezing. You can check the refrigerant level, but it's best to have a professional HVAC technician handle this.

  3. 3

    Verify the blower fan is working

    Make sure the blower fan is running properly to ensure adequate airflow across the evaporator coil. If the fan is malfunctioning, it can cause the coil to freeze.

Frequently Asked Questions

How do I know if my evaporator coil is freezing?

Signs that your evaporator coil is freezing include cold air blowing from the vents, reduced airflow, and ice buildup on the coil itself.

What should I do if my evaporator coil is freezing?

If your evaporator coil is freezing, you should turn off the HVAC system and allow the coil to thaw completely before troubleshooting further. Once thawed, you can check the air filter, refrigerant levels, and blower fan to identify and fix the underlying issue.

When should I call a professional HVAC technician?

If you are unable to identify and fix the cause of the evaporator coil freezing, or if the issue persists, it's best to call a professional HVAC technician. They have the expertise and tools to properly diagnose and repair the problem.

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