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I recently purchased a used Honda Accord and failed to check if the a/c (R134A) worked or not. Unfortunately, the a/c doesn't work at all. I'm not sure if the compressor is turning on, but when i hit the ac button with the car idling, the car vibrates quite a bit, and the engine rpms drop. The ac only blows hot air. I just recently checked the freon pressure by connecting a guage to the low side port and came up with a reading up 25 pounds. (Should i add more freon?)

Also, about the vibration... I found out that the front engine mount was cracked, but replacing it improved the idle vibration only slightly. The car vibrates in D and R, but it is hardly noticeable in Park or Neutral. It isn't a continual vibration, it pulsates every second or so. The vibration goes away when the RPM's go over 900.

Can anyone give me any advice on what to do?