Thank you for your sensible comments!
Dye is more reliable (no false positives), is it not? But then, I believe I need a special device to inject the UV dye, or how is that done? Sorry for those beginners questions.
BTW, me too I do not feel like doing an evaporator job...
dave Rose, I'll follow your tips. If the system needs only a little (let's say about half a pound) of refrigerant would you still add oil?
Many thanks! Bruno

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1992 300TE 160 kmiles