'80 300TD. It was already changed to R-134, cheaply I'm sure. The air has only been blowing out of the vents about 60 degrees, so I bought a filling hose assy, some R-134 and a handy dandy pressure gauge that looks like a tire gauge, pencil type. Well, when I went to check the low side pressure, with engine and AC running of course, this yellow foam/slime oozed out of the conversion fitting (pic attached). What is that? Is that what the oil charge stuff looks like. I'm stumped, and am waiting to add the R-134 till I find out what that snottage is. Thank you once again.
JImmy

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