We're surmising that it's a bad "O" ring (God forbid it's a bad evaporator/tube), so just replacing the o ring sounds good. Many folks find the job hard on their back, so they replace the TXV while there, so they don't have to stand on their head again. TVX is not too expensive.

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The Golden Rule

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