Dave,
Your'e right about not topping off the system, for this would be a waste
of product, if it had a suspected leak.

However,in certain situations you must at least get enough charge into
the lines to circulate the refrigerant , if you want to use a dye to
locate a tough to find leak.

It's a catch 22 type game.
You're damned if you do, you're damned if you don't.

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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)