So my condensor is shot from the front mount IC charge pipe rubbing on it. Rockauto lists about 6 different units. What is the correct part number? Also, I had the car retrofitted for R134 and am confused at what is actually the low pressure side of the system to add coolant? I thought it was the port close to the compressor, but the cap on it has "H" on it, while the port close to the dryer/firewall has the "L" on it.