There are multiple reasons why your car’s air conditioner isn’t blowing cold air. Check for the following issues:

  • Lack of Refrigerant
  • A/C Compressor Not Engaging
  • Refrigerant Not Circulating Properly
  • Interior Air Blend Door Stuck to HEAT Position

How to Troubleshoot a Broken A/C

The first thing you’ll want to determine is whether the compressor engages when you turn on the car’s air conditioner. The compressor looks like a small motor, and it has an oversized wheel on one end. That wheel, which should be spinning, is the compressor clutch. If it isn’t, your air conditioner will blow warm air.

If the compressor seems to engage and air is flowing but it isn’t cold, you may need new refrigerant. You should not only check for the presence of refrigerant, but also the refrigerant pressure inside the assembly. There may not be enough pressure to engage the compressor. Adding liquid should remedy the problem provided there are no leaks.

When the refrigerant and compressor systems both seem to be working normally but the air conditioner still isn’t producing cold air, there is probably a circulation or a heat switch problem. Both of these issues usually stem from obstacles or blockage in the circulation system that needs to be physically removed or flushed out to make the air conditioner run cold again.

Other possibilities include faults in the temperature sensor or the module that controls the entire system. These issues need to be addressed by professional mechanics that are qualified to diagnose A/C issues.

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