Brian Guy

2010 Dodge Ram 2500 Laramie, Megacab, automatic, 6.7 liter, 4wd. I had an Evap core leak. I replaced the Evap core and hooked up Freon lines and pulled vacuum. I let pump run for 40+ minutes but did not see any oil come out of exhaust on vacuum pump. I unhooked pump and let it sit 6 hours with no change in vacuum. I know the old evap core was leaking, it had Freon/oil all over one side of it. Can I assume that there is no oil left in system after pulling the vacuum, even though I didn't see any more come out of the vacuum pump,and add the recommended amount as if it were empty? If so how much would that be? If not, then what should I add?

Thanks,
Brian Guy

Brian Guy

Nevermind. I found you don't have to add oil unless you replace condenser, compressor, or dryer. Just add Freon. It's running good now.