IMHO:

For $90, do NOT go back there. Just write it off. On a 202, with folks who don't know what they are doing, you could end up with $2K in A/C repairs in a blink.

Get to a good A/C shop for recovery, flush, diag., leak test, vacuum recharge.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)