I recently replaced an old 10 seer leaking unit with a new weatherking. It would blow cold air sometimes and not at other times, but it never worked very well. I claimed the warranty on it and installed a new unit again. Now it is blowing air of only a 4 degree difference from the return to the vent. The pressure on the gauges on the low side now gradually increases to 120 (maxed out) and I know it had a good charge of about 70 when it was installed. The high pressure side is only getting to about 150. Anyone seen this problem? Is it time to replace the A-coil two?