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Old 07-01-2003, 03:17 AM
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Join Date: Mar 2003
Posts: 47
hissing sound

After a few minute intervals, I keep hearing a hissing sound, like somebody is sucking air through a straw. It seems to be coming frm the air ducts. Is this the air con?
Is it normal?


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Old 07-01-2003, 03:31 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
It usually means your AC refirgerant pressure is low or there's a snake in your ducts. Have it charged with the appropriate refrigerant and perhaps have it checked for leaks. If you have an R134a system, you can even recharge it yourself if you trust your abilities.

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Old 07-01-2003, 11:52 AM
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I believe that not all hissing is abnormal...the cycling of the compressor as it pressurizes will cause that sound. Mine always had, regardless of freon levels...
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Old 07-02-2003, 03:18 AM
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Join Date: Mar 2003
Posts: 47
Thats what another guy said:

its the AC compressor cycling - perfectly normal when the AC is running

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