I have a 2007 si and I am having a problem with my a/c blowing warm after a while of use, its usually random but I'd say within 30 min of driving. I've checked my pressures and the low side is 45 and close to 200 on the high side while the a/c is working, haven't got a chance to check the pressures while its not working. I am thinking about evacing the a/c freon and recharge with new freon as I may have air in the system I also have 2 spare 12oz r134 laying around. Any opinions? thanks

 

I would check the freon first.

Have you check if the compressor is working correctly also?

 

Most common problem on these is bad compressor coil relay. Find the correct relay in the under hood fuse box And try applying pressure with your finger. See if the compressor cycles Off with it being pressed and cycles back on when you let off the relay.

 

When I had this issue, it was a bad air-mix motor.