Also with the 134 charge you must use the correct oil compatible with the compressor and the 134. The compressor came shipped with oil which I drained and flushed out with the PAG46 Then I used a digital postal scale to get the correct amount of oil by weight into the compressor following the FSM for a new system with every component replaced . The amount of oil will vary depending on what is replaced in the system, so follow the FSM.