Due to the evaporator in my 1980 W116 300SD being corroded from being covered in wet debris for years, I bought a new Four Seasons one (which had to be highly tweaked to fit). I noticed that the Four Seasons one has a Schrader valve in it at one of the fittings where the expansion valve wire attaches.

I assume this Schrader valve is just for pressure testing the evaporator at the factory. If it's kept in place, I assume it will block the flow of refrigerant to the wire coming off of the expansion valve.

Remove the valve core, or keep it in place?



Also, which is preferable; the original, high-quality expansion valve which is nearly forty years old, or a brand-new Chinese-made Four Seasons one? I just don't know about the longevity of a part that's so old.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles