Thread: Air con makes strange hissing noises
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Old 08-17-2006, 08:45 AM
nhdoc nhdoc is offline
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Join Date: Dec 2004
Location: Nashua, NH
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It's probably a little low on refrigerant...that's one sign when the level is getting low you will hear it hiss through the expansion valve.

If it is getting worse then you will hear the hissing all the time when the compressor is running, then it will stop working all together...then you know you have a real leak, otherwise you might just need to have it topped off.
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