I have a 2002 Acura RSX that has AC Problem. Blows very cold air, but not all the time. As long as RPM is running at drive speeds, I have cold air. However, at stop lights the air temp goes warm. If I accelerate, I get nice cold air again. The other thing I note is that it may be blowing perfectly fine cold air as I drive a half hour or hour down the interstate. All of a sudden, air gets warm. I turn it off for 15 minutes, turn back on, air is cold again. Any suggestions???

SOURCE: 2003 acura rsx cough sputter

Regarding the heating issue, sounds like your thermostat is stuck open so the coolant isn't heating up. (May need replacement) Does your engine temp guage show it running colder than normal?

SOURCE: 02 acura rsx-s AC stopped

my 2002 rsx type s ac did the exact same thing. got to the point that i started hearing a weird noise like stuff clunking around everytime i turned it on. took it into the dealer and they said the compressor just fell apart inside... i had to buy a new one and it wasnt cheap to replace. problem was, the same equipment also played a part in the heating system too... so they told me.

SOURCE: My Acura RSX 2002 AC

If your vehicle had a condenser replaced and is now only blowing warm, chances are a cheap version of the OEM was installed. Demand an OEM replacement or you will never have cold air

If it is the original it is getting plugged up and needs to be replaced