My car has had a slow leak in the ac for a season or so. Now it just blows out. While looking for the leak I seen its leaking off the back side of the compressor. The two aluminum hoses appear to be lose. My question is are there some o ring seals in that area? If I pull it the hose's and place new seals will I need to use a vacuum pump or should I just give it a go with out a vacuum pump? Its my work car and I would hate to not use it. I have already sunk to much in this car this year with engine work.