I just replaced the compressor on my S10, I had to do this and make sure it was filled with the correct amount of PAG oil, mine shipped with 0 in it. Between that and replacing my accumulator I had to add 8oz total to the system. Replaced the orifice tube, and the condenser, got it vacuumed and filled with 134 at a shop and now the A/C in the truck freezes you out.