So it appears I've got a leak in my AC system. I've charged it twice in the past few weeks and now it is not working again. The first time I thought it was a bad port which I fixed. But now it seems low again.

It appears I have a leak somewhere.

In looking araound ebay has some for under $30 shipped. Harbor Freight has one for $80 and I have a 20% off coupon.

How well do these things work? And how easy will it be to pinpoint a leak with one of them?

I have just about all other AC tools including crimper to repair and make hoses.

Thanks,
Ryan

__________________
2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD