When the expansion valve is opened, an abnormal \"whooshing\" sound persists for about 10 seconds
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When cooling the rear compartment, opening the condensation valve results in an abnormal \"whistling\" sound that lasts for about 10–20 seconds; this occurs occasionally. How can this phenomenon be avoided?
There might not be enough refrigerant. Gas flows through the expansion valve.
When the expansion valve leaks fluid, there is a hissing sound, but it goes away after a while as well. Just make sure the cooling effect is good; if you’re not confident, release some air from the high-pressure connection to see whether it’s gas or liquid. It should normally be a liquid