What happens if I overfill my A/C system?

I want to save myself the trip and refill my A/C refrigerant at home, but I’m not sure how to tell the right amount to add or if I’m adding too much! What happens if I overfill my A/C system?

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Answer provided by
Kathryn Mae Kurlychek
Answered on Jul 14, 2022
You can have too much of a good thing, including adding refrigerant to your car’s A/C system! Overfilling your car’s A/C system can cause damage to your vehicle, including the following:
  • Strain on the compressor and accessory belt
  • Less efficient cooling in your car
  • An overworked engine (and worse fuel economy)
  • Engine overheating
  • A/C failure
Any of these problems could mean costly maintenance bills—if you refilled your A/Cs refrigerant at home and think you may have added too much, it’s best to take it to a professional for a second opinion. Sometimes, a technician will need to purge your A/C unit to correct the issue.
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