The high side access port on my 1999 Suburban (dual A/C) started leaking. Looks like to replace it I need to pull it. Going to have to evacuate the system and recharge.

Last time I did this 10 years ago, I borrowed a vacuum pump from a friend. Now I want to buy my own online. There are many to choose from. Need advice if this is the right choice.

Leaning toward the Robair 15134 which is a 4CFM 2 stage unit. I'm not yet clear on the fittings but it appears to have the right ones.

I need a better source of technical info. Do you know if the DYI subscription to ALLDATA includes detailed info on A/C procedures?