Never have done an evaporator (fear factor ). Does the evaporator sit behind the heater core directly or a little below the heater core? I didn't look closely when I had the fan removed; can I see the evaporator off to the left if I pull the fan/housing only? I'd sure like to spray some foam A/C cleanser in there after seeing your picture. This is on a 126.

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The Golden Rule

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