I know these A/C systems can be a pain, but I am not sure why mine is not working. I have a gauge and when the a/c is off, it shows 45psi (which is in the good zone). However, when I turn it on, the compressor turns on for less than a second then shuts off. So the gauges shows that when the compressor turns on, the PSI dropps to 20 or so and then shuts off, as it should. It should shut off when there is not enough pressure in the system. Does anyone know why the system looses pressure when the compressor turns on and then it builts back up? So what I have is a compressor going on and off every couple of mins while the systems looses pressure and they builds back up... Any thoguhts?