Thank you for the replies...makes sense. Ill give it a test and if by some miracle my system has something in it Ill take it in.

What doesn't make sense is that they use 134a for computer dusters and who knows what else.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car