The AC system may blow warm air due to refrigerant loss caused by a leaking low pressure AC hose. These hoses commonly develop a leak at the hose crimp connection.Google+
Car Problem Reports
Nissan Altima Low Pressure AC Hose May Leak at Crimped Connection
Nissan Altima Problem
Average Mileage: 103,501 mi (18,000 mi - 205,999 mi)
Heat works only when moving and air conditioning blows whatever temperature is outside
Visitor, 2005 Nissan Altima, 95,000 mi
A/C not cool. Replaced pressure hose.
Visitor, 2006 Nissan Altima, 54,260 mi
I had a new engine put in my car in 2010 due to an engine recall and every since my car has not been the same. My air conditioner is blowing hot air I had it serviced but now Nissan is claiming I need to put over $1200 to get new hoses but I refuse to put another penny into this car. I will never purchase another Nissan!
Looks like a tiny pin prick hole near the crimped area.
Visitor, 2005 Nissan Altima, 48,000 mi
Leak detected at front connection using blacklight detection.
Visitor, 2002 Nissan Altima, 58,000 mi
Both hoses are leaking...
Visitor, 2003 Nissan Altima, 67,123 mi
Ac problem, hat air
Visitor, 2000 Nissan Altima, 125,000 mi
Low pressure AC hose leaking. Still waiting for it to be replaced.
Visitor, 2005 Nissan Altima, 33,000 mi
replaced pressure hose...$400
Visitor, 2005 Nissan Altima, 105,000 mi
A/C Low pressure line leaking. Estimate cost to fix 350