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Air conditioner is blowing warm air

(2003 Nissan Altima)
in Walnut, CA on August 27, 2010
Before recharging system the air conditioner would blow cool and somtimes warm air and A/C lite would go out when it started to blow warm air. So I recharged the air conditioner on my nissan altima and it blew cold air while system was charging and after driving for 5 min. it started to blow warm air again. I did not see any spots were it could be leaking from and would the low line still have pressure if it were leaking? what are the possible problems?
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Popular Answer
Sound like expansion valve is freezing. Make sure the correct amount of freon too much can cause that or the expansion valve is sticking/stuck close.
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