I just replaced every component of my a/c system and I'm having some issues charging the new refrigerant. Since I used all new components and lines, I went ahead and used some pour in PAG oil for this system. I poured 4 ounces in the new compressor, 2 ounces in the evaporator, and 2 in the condenser. I then drew a vacuum on the system for over an hour. I let it sit for 10 minutes or so without the pump on the check for leaks. I hooked up a can of R134a and opened ONLY the low side valve on the gauges and the can tap. When I started the car up and turned on the compressor, the high side was reading 300 psi and rising while the low side was around 50 psi and rising. When the compressor turned off the pressure rose to between 125-150 psi on the low side! That's with just one can of refrigerant. The ambient temperature was around 87 degrees. Question #1 - I realize that the high and low side pressures will stabilize when the compressor is off, but are they supposed to be identical? Question #2 - What should the high and low pressure readings be for this car with the compressor running and while off? Question #3 - Would insufficient airflow across the condenser cause this?