I have a 2003 Dodge Durango 4.7 liter. I'm running into AC problems. i replaced my ac compressor due to a bad clutch bearing. could not afford new compressor so i bought a used one installed it recharged it with 134a till it was in the green at the correct outside temp. blowing ice cold ac. my wife takes it to work and says its blowing warm air i check it with a gauge and its in the red, i let some out and it goes back to green blowing cold she takes it to work and same thing happens warm and in the red. Anybody know whats wrong??