AC Hissing Or Buzzing Noise
A hissing or buzzing sound from the AC, often near the dashboard or under the hood. This can be normal refrigerant flow or a sign of a leak or valve issue.
Find a TechnicianCommon causes
- Refrigerant moving through the expansion valve (can be normal)
- A refrigerant leak hissing under pressure
- Failing expansion valve or orifice tube
- Compressor or solenoid buzzing
- Vacuum leak in the control system
Frequently asked questions
Is a hissing sound after I turn the car off normal?
A brief hiss as pressures equalize can be normal. A loud or continuous hiss, especially with weak cooling, suggests a leak.
Should I worry about a buzzing AC?
A persistent buzz can be an electrical solenoid or a struggling compressor and is worth a diagnostic.
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