huh? where did you take the pressure reading from? A low side pressure will be somewhere in the range of 20-35 psi and high side something in 180-220 psi range. If it's zero, there is obviously no refrigerant in the system.

Oh and Wedley,
something I just noticed this weekend,the lousy heater valve on the accord doesn't close all the way (yeah I know some are designed to stay slightly open), but first turn your knob all the way to max cold and then manually close that water heater valve (located just underneath the intake plenum on the 5th Gen accords). You'll notice it moves just a notch more in the direction towards the front bumper, that's the complete closed position. Try not to turn your heater knob until winter hits and you need heat. Apparenlty for me, I tried adjust the valve, but the way it is designed it just won't allow to close completely, unless you manually shut it all the way. Dude I tell you, big difference, the damn a/c almost froze me out over the weekend, quite impressed indeed, especially for the R-134 system and in a black car.