Posted on 11/2/2025
When you hear hissing sounds coming from your vehicle, you might start thinking the worst. One type of hissing coming from around your air conditioner may be a normal sound, or it could be a sign of serious trouble. First - the normal sound. When you turn off your vehicle, the refrigerant goes from its high-pressure side to the low-pressure side. Some of those noises are normal. But when it hisses all the time, that's another story. One cause could be that the refrigerant is leaking. Air conditioners are fairly complex systems that involve various pumps, hoses, valves and motors. When your air conditioner is cooling, the refrigerant changes from a gas to a liquid and back. That refrigerant is under pressure, and there are many places it can leak from. A hissing sound can also be a failed valve in your air conditioner's compressor. It is what controls the refrigerant's pressurization. It's important to have this fixed fairly qu ... read more