First question.
A. Did it work before?
Second question.
Why did you change the system.
Third question.
How did you convert it? Just feeding a couple of cans of R134 into an old, non-working R12 system just wont cut the mustard.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now